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Sam McCall 5c02fe1faa Revert "[Concepts] Placeholder constraints and abbreviated templates" 
This reverts commit e57a9abc4b.

Parser/cxx2a-placeholder-type-constraint.cpp has MSan failures.

Present at 7b81c3f8793d30a4285095a9b67dcfca2117916c:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan/builds/17133/steps/check-clang%20msan/logs/stdio
not present at eaa594f4ec54eba52b03fd9f1c789b214c66a753:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan/builds/17132/steps/check-clang%20msan/logs/stdio

Stack trace:
```
==57032==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0xccfe016 in clang::AutoTypeLoc::getLocalSourceRange() const /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/include/clang/AST/TypeLoc.h:2036:19
    #1 0xcc56758 in CheckDeducedPlaceholderConstraints(clang::Sema&, clang::AutoType const&, clang::AutoTypeLoc, clang::QualType) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:4505:56
    #2 0xcc550ce in clang::Sema::DeduceAutoType(clang::TypeLoc, clang::Expr*&, clang::QualType&, llvm::Optional<unsigned int>, bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:4707:11
    #3 0xcc52407 in clang::Sema::DeduceAutoType(clang::TypeSourceInfo*, clang::Expr*&, clang::QualType&, llvm::Optional<unsigned int>, bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:4457:10
    #4 0xba38332 in clang::Sema::deduceVarTypeFromInitializer(clang::VarDecl*, clang::DeclarationName, clang::QualType, clang::TypeSourceInfo*, clang::SourceRange, bool, clang::Expr*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaDecl.cpp:11351:7
    #5 0xba3a8a9 in clang::Sema::DeduceVariableDeclarationType(clang::VarDecl*, bool, clang::Expr*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaDecl.cpp:11385:26
    #6 0xba3c520 in clang::Sema::AddInitializerToDecl(clang::Decl*, clang::Expr*, bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Sema/SemaDecl.cpp:11725:9
    #7 0xb39c498 in clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseDecl.cpp:2399:17
    #8 0xb394d80 in clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseDecl.cpp:2128:21
    #9 0xb383bbf in clang::Parser::ParseSimpleDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, bool, clang::Parser::ForRangeInit*, clang::SourceLocation*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseDecl.cpp:1848:10
    #10 0xb383129 in clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::Parser::ParsedAttributesWithRange&, clang::SourceLocation*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/llvm/include/llvm/ADT/PointerUnion.h
    #11 0xb53a388 in clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::Parser::ParsedAttributesWithRange&) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseStmt.cpp:221:13
    #12 0xb539309 in clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseStmt.cpp:106:20
    #13 0xb55610e in clang::Parser::ParseCompoundStatementBody(bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseStmt.cpp:1079:11
    #14 0xb559529 in clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseStmt.cpp:2204:21
    #15 0xb33c13e in clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/Parser.cpp:1339:10
    #16 0xb394703 in clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseDecl.cpp:2068:11
    #17 0xb338e52 in clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/Parser.cpp:1099:10
    #18 0xb337674 in clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/Parser.cpp:1115:12
    #19 0xb334a96 in clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/Parser.cpp:935:12
    #20 0xb32f12a in clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/Parser.cpp:686:12
    #21 0xb31e193 in clang::ParseAST(clang::Sema&, bool, bool) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Parse/ParseAST.cpp:158:20
    #22 0x80263f0 in clang::FrontendAction::Execute() /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Frontend/FrontendAction.cpp:936:8
    #23 0x7f2a257 in clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:965:33
    #24 0x8288bef in clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:290:25
    #25 0xad44c2 in cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/tools/driver/cc1_main.cpp:239:15
    #26 0xacd76a in ExecuteCC1Tool(llvm::ArrayRef<char const*>) /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/tools/driver/driver.cpp:325:12
    #27 0xacc9fd in main /b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm-project/clang/tools/driver/driver.cpp:398:12
    #28 0x7f7d82cdb2e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
    #29 0xa4dde9 in _start (/b/sanitizer-x86_64-linux-bootstrap-msan/build/llvm_build_msan/bin/clang-11+0xa4dde9)
```
 		2020-01-23 10:38:59 +01:00
..
Interp [c++20] P1959R0: Remove support for std::*_equality. 2019-12-16 17:49:45 -08:00
APValue.cpp Silence static analyzer getAs<RecordType> null dereference warnings. NFCI. 2019-10-03 11:22:48 +00:00
ASTConcept.cpp [Concepts] Fix circular AST->Sema dependency in ASTConcept.cpp 2020-01-22 04:08:59 +02:00
ASTConsumer.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
ASTContext.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
ASTDiagnostic.cpp Fix cppcheck uninitialized variable in DiffTree() constructor warning. NFCI. 2020-01-13 15:07:57 +00:00
ASTDumper.cpp When dumping the AST to JSON, dump the type information from a typeid expression with a type operand. 2019-05-27 14:34:31 +00:00
ASTImporter.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
ASTImporterLookupTable.cpp [ASTImporter] Fix unhandled cases in ASTImporterLookupTable 2019-06-11 13:35:25 +00:00
ASTStructuralEquivalence.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
ASTTypeTraits.cpp Remove Expr.h include from ASTContext.h, NFC 2019-12-06 15:30:49 -08:00
AttrImpl.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CMakeLists.txt [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
CXXABI.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CXXInheritance.cpp [Clang] Migrate llvm::make_unique to std::make_unique 2019-08-14 23:04:18 +00:00
Comment.cpp Fix "pointer is null" static analyzer warning. NFCI. 2020-01-07 13:41:52 +00:00
CommentBriefParser.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CommentCommandTraits.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
CommentLexer.cpp [AST] CommentLexer - Remove (optional) Invalid parameter from getSpelling. 2019-09-18 12:11:16 +00:00
CommentParser.cpp Adds a warning when an inline Doxygen comment has no argument 2019-08-05 08:05:16 +00:00
CommentSema.cpp [Wdocumentation] Implement \anchor 2019-12-21 14:52:21 +01:00
ComparisonCategories.cpp [c++20] P1959R0: Remove support for std::*_equality. 2019-12-16 17:49:45 -08:00
DataCollection.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Decl.cpp Reapply Allow system header to provide their own implementation of some builtin 2020-01-17 09:58:32 +01:00
DeclBase.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
DeclCXX.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
DeclFriend.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
DeclGroup.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
DeclObjC.cpp [objc_direct] Tigthen checks for direct methods 2019-12-20 10:57:36 -08:00
DeclOpenMP.cpp [OPENMP 5.0]Initial support for 'allocator' clause. 2019-03-12 18:52:33 +00:00
DeclPrinter.cpp [Concepts] Type Constraints 2020-01-15 04:02:39 +02:00
DeclTemplate.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
DeclarationName.cpp [AST] Let DeclarationNameInfo printing use PrintingPolicy, and fix const-correctness 2019-11-15 19:19:41 +01:00
Expr.cpp Fix the invisible-traversal to ignore more nodes 2020-01-20 11:59:13 +00:00
ExprCXX.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
ExprClassification.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
ExprConcepts.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
ExprConstant.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
ExprObjC.cpp [AST][NFC] Add const children() accessors to all AST nodes 2019-04-12 15:36:02 +00:00
ExternalASTMerger.cpp Modernize llvm::Error handling in ExternalASTMerger 2019-11-14 13:58:32 +01:00
ExternalASTSource.cpp [clang] Improve LLVM-style RTTI support in ExternalASTSource/ExternalSemaSource 2019-12-15 18:11:01 +01:00
FormatString.cpp [Sema] Split out -Wformat-type-confusion from -Wformat-pedantic 2019-10-04 19:20:27 +00:00
FormatStringParsing.h Add a missing header comment, NFC 2019-08-13 22:01:39 +00:00
InheritViz.cpp Silence static analyzer getAs<RecordType> null dereference warnings. NFCI. 2019-10-03 11:22:48 +00:00
ItaniumCXXABI.cpp [c++20] Fix some ambiguities in our mangling of lambdas with explicit 2019-09-05 01:23:47 +00:00
ItaniumMangle.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
JSONNodeDumper.cpp [Wdocumentation] Implement \anchor 2019-12-21 14:52:21 +01:00
Linkage.h Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Mangle.cpp [NFC] Use isX86() instead of getArch() 2020-01-07 17:35:44 +08:00
MicrosoftCXXABI.cpp Separate the MS inheritance model enum from the attribute, NFC 2019-11-22 16:06:30 -08:00
MicrosoftMangle.cpp Fix "pointer is null" static analyzer warning. NFCI. 2020-01-11 16:02:23 +00:00
NSAPI.cpp Removed dead code from clang/AST/NSAPI.h 2019-08-29 06:30:12 +00:00
NestedNameSpecifier.cpp Fix "null pointer passed to nonnull argument" clang static analyzer warnings. NFCI. 2020-01-14 14:00:36 +00:00
ODRHash.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
OSLog.cpp os_log: Allow specifying mask type in format string. 2018-11-06 07:05:14 +00:00
OpenMPClause.cpp [OpenMP][NFCI] Use the libFrontend ProcBindKind in Clang 2019-12-26 11:04:07 -06:00
ParentMap.cpp [OPENMP]Fix PR42632: crash on the analysis of the OpenMP constructs. 2019-07-17 18:03:39 +00:00
PrintfFormatString.cpp [Sema][ObjC] Fix a -Wformat false positive with localizedStringForKey 2019-08-14 16:57:11 +00:00
QualTypeNames.cpp Fix crash in getFullyQualifiedName for inline namespace 2019-12-28 16:35:51 +03:00
RawCommentList.cpp [clang] Refactor doc comments to Decls attribution 2019-08-13 18:11:44 +00:00
RecordLayout.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
RecordLayoutBuilder.cpp Move vtordisp mode from Attr class to LangOptions.h, NFC 2019-11-22 15:47:46 -08:00
ScanfFormatString.cpp Fix parameter name comments using clang-tidy. NFC. 2019-07-16 04:46:31 +00:00
SelectorLocationsKind.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
Stmt.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
StmtCXX.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
StmtIterator.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
StmtObjC.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
StmtOpenMP.cpp [OpenMP][NFCI] Introduce llvm/IR/OpenMPConstants.h 2019-12-10 00:10:09 -06:00
StmtPrinter.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
StmtProfile.cpp [Concepts] Requires Expressions 2020-01-19 00:23:26 +02:00
StmtViz.cpp Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
TemplateBase.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
TemplateName.cpp [c++20] Implement P0846R0: allow (ADL-only) calls to template-ids whose 2019-05-09 03:31:27 +00:00
TextNodeDumper.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
Type.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
TypeLoc.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
TypePrinter.cpp Revert "[Concepts] Placeholder constraints and abbreviated templates" 2020-01-23 10:38:59 +01:00
VTTBuilder.cpp Silence static analyzer getAs<RecordType> null dereference warnings. NFCI. 2019-10-03 11:22:48 +00:00
VTableBuilder.cpp List implicit operator== after implicit destructors in a vtable. 2020-01-21 15:54:40 -08:00