Revert "[lldb] Enable C++14 when evaluating expressions in a C++14 frame"

This reverts commit 5f88f39ab8. It broke these
three tests on the Window bot:
  lldb-api :: commands/expression/completion/TestExprCompletion.py
  lldb-api :: lang/cpp/scope/TestCppScope.py
  lldb-api :: lang/cpp/standards/cpp11/TestCPP11Standard.py

lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp

@@ -491,11 +491,9 @@ ClangExpressionParser::ClangExpressionParser(
     // be re-evaluated in the future.
     lang_opts.CPlusPlus11 = true;
     break;
-  case lldb::eLanguageTypeC_plus_plus_14:
-    lang_opts.CPlusPlus14 = true;
-    LLVM_FALLTHROUGH;
   case lldb::eLanguageTypeC_plus_plus:
   case lldb::eLanguageTypeC_plus_plus_11:
+  case lldb::eLanguageTypeC_plus_plus_14:
     lang_opts.CPlusPlus11 = true;
     m_compiler->getHeaderSearchOpts().UseLibcxx = true;
     LLVM_FALLTHROUGH;

lldb/test/API/lang/cpp/standards/cpp11/Makefile

@@ -1,4 +0,0 @@
-CXX_SOURCES := main.cpp
-CXXFLAGS_EXTRAS := -std=c++11
-
-include Makefile.rules

lldb/test/API/lang/cpp/standards/cpp11/TestCPP11Standard.py

@@ -1,19 +0,0 @@
-import lldb
-from lldbsuite.test.decorators import *
-from lldbsuite.test.lldbtest import *
-from lldbsuite.test import lldbutil
-
-class TestCase(TestBase):
-
-    mydir = TestBase.compute_mydir(__file__)
-
-    def test(self):
-        self.build()
-        lldbutil.run_to_source_breakpoint(self, "// break here", lldb.SBFileSpec("main.cpp"))
-
-        # Run an expression that is valid in C++11 (as it uses nullptr).
-        self.expect_expr("nullptr == nullptr", result_type="bool", result_value="true")
-
-        # Run a expression that is not valid in C++11 (as it uses polymorphic
-        # lambdas from C++14).
-        self.expect("expr [](auto x) { return x; }(1)", error=True, substrs=["'auto' not allowed in lambda parameter"])

lldb/test/API/lang/cpp/standards/cpp11/main.cpp

@@ -1,3 +0,0 @@
-int main() {
-  return 0; // break here
-}

lldb/test/API/lang/cpp/standards/cpp14/Makefile

@@ -1,4 +0,0 @@
-CXX_SOURCES := main.cpp
-CXXFLAGS_EXTRAS := -std=c++14
-
-include Makefile.rules

lldb/test/API/lang/cpp/standards/cpp14/TestCPP14Standard.py

@@ -1,19 +0,0 @@
-import lldb
-from lldbsuite.test.decorators import *
-from lldbsuite.test.lldbtest import *
-from lldbsuite.test import lldbutil
-
-class TestCase(TestBase):
-
-    mydir = TestBase.compute_mydir(__file__)
-
-    def test(self):
-        self.build()
-        lldbutil.run_to_source_breakpoint(self, "// break here", lldb.SBFileSpec("main.cpp"))
-
-        # Run an expression that is valid in C++11 (as it uses nullptr).
-        self.expect_expr("nullptr == nullptr", result_type="bool", result_value="true")
-
-        # Run a expression that is only valid in C++14 that (as it uses
-        # polymorphic lambdas).
-        self.expect_expr("[](auto x) { return x; }(1)", result_type="int", result_value="1")

lldb/test/API/lang/cpp/standards/cpp14/main.cpp

@@ -1,3 +0,0 @@
-int main() {
-  return 0; // break here
-}