Remove unused Endian.h includes, NFC

Mainly avoids including Host.h everywhere:

$ diff -u <(sort thedeps-before.txt) <(sort thedeps-after.txt) \
    | grep '^[-+] ' | sort | uniq -c | sort -nr
   3141 - /usr/local/google/home/rnk/llvm-project/llvm/include/llvm/Support/Host.h

clang/lib/Driver/Distro.cpp

@@ -11,9 +11,10 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSwitch.h"
-#include "llvm/Support/ErrorOr.h"
-#include "llvm/Support/MemoryBuffer.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/MemoryBuffer.h"
 
 using namespace clang::driver;
 using namespace clang;

clang/lib/Driver/Driver.cpp

@@ -38,8 +38,8 @@
 #include "ToolChains/NaCl.h"
 #include "ToolChains/NetBSD.h"
 #include "ToolChains/OpenBSD.h"
-#include "ToolChains/PS4CPU.h"
 #include "ToolChains/PPCLinux.h"
+#include "ToolChains/PS4CPU.h"
 #include "ToolChains/RISCVToolchain.h"
 #include "ToolChains/Solaris.h"
 #include "ToolChains/TCE.h"
@@ -71,6 +71,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Process.h"

clang/lib/Driver/ToolChains/Cuda.cpp

@@ -18,6 +18,7 @@
 #include "clang/Driver/Options.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/Program.h"

clang/lib/Tooling/ExpandResponseFilesCompilationDatabase.cpp

@@ -12,6 +12,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/StringSaver.h"

clang/tools/driver/cc1gen_reproducer_main.cpp

@@ -18,6 +18,7 @@
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/YAMLTraits.h"

clang/unittests/AST/StructuralEquivalenceTest.cpp

@@ -1,8 +1,9 @@
 #include "clang/AST/ASTContext.h"
-#include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/AST/ASTStructuralEquivalence.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
 #include "clang/Frontend/ASTUnit.h"
 #include "clang/Tooling/Tooling.h"
+#include "llvm/Support/Host.h"
 
 #include "Language.h"
 #include "DeclMatcher.h"

clang/unittests/CodeGen/TBAAMetadataTest.cpp

@@ -18,6 +18,7 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "gtest/gtest.h"
 #include <memory>

clang/unittests/Driver/DistroTest.cpp

@@ -11,9 +11,11 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Driver/Distro.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "gtest/gtest.h"
+
 using namespace clang;
 using namespace clang::driver;
 

clang/unittests/Tooling/RecursiveASTVisitorTests/LambdaExpr.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "TestVisitor.h"
+#include "llvm/Support/Host.h"
 #include <stack>
 
 using namespace clang;

lld/ELF/DriverUtils.cpp

@@ -23,6 +23,7 @@
 #include "llvm/Option/Option.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 

lld/MinGW/Driver.cpp

@@ -42,6 +42,7 @@
 #include "llvm/Option/Option.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 
 #if !defined(_MSC_VER) && !defined(__MINGW32__)

lld/wasm/Driver.cpp

@@ -25,6 +25,7 @@
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 #include "llvm/Support/TarWriter.h"

lldb/source/Plugins/SymbolFile/NativePDB/DWARFLocationExpression.h

@@ -14,6 +14,7 @@
 
 namespace llvm {
 class APSInt;
+class StringRef;
 namespace codeview {
 class TypeIndex;
 }

llvm/include/llvm/Support/Endian.h

@@ -13,9 +13,7 @@
 #ifndef LLVM_SUPPORT_ENDIAN_H
 #define LLVM_SUPPORT_ENDIAN_H
 
-#include "llvm/Support/AlignOf.h"
 #include "llvm/Support/Compiler.h"
-#include "llvm/Support/Host.h"
 #include "llvm/Support/SwapByteOrder.h"
 #include <cassert>
 #include <cstddef>

llvm/tools/llvm-ar/llvm-ar.cpp

@@ -26,6 +26,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormatVariadic.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/LineIterator.h"
 #include "llvm/Support/MemoryBuffer.h"

llvm/tools/llvm-exegesis/lib/LlvmState.cpp

@@ -13,6 +13,7 @@
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCFixup.h"
 #include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"

llvm/tools/llvm-objcopy/llvm-objcopy.cpp

@@ -35,6 +35,7 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ErrorOr.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/Path.h"

llvm/unittests/Support/CommandLineTest.cpp

@@ -14,6 +14,7 @@
 #include "llvm/Config/config.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"