Clang: Go through CLANG-UPGRADE-CHECK

Change-Id: Iaaaea598d020a44bcdc60a8d06ee28a1f28386bb
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/compileroptionsbuilder.cpp

@@ -503,6 +503,7 @@ static QStringList languageFeatureMacros()
         QLatin1String("__cpp_exceptions"),
         QLatin1String("__cpp_fold_expressions"),
         QLatin1String("__cpp_generic_lambdas"),
+        QLatin1String("__cpp_guaranteed_copy_elision"),
         QLatin1String("__cpp_hex_float"),
         QLatin1String("__cpp_if_constexpr"),
         QLatin1String("__cpp_inheriting_constructors"),
@@ -514,6 +515,7 @@ static QStringList languageFeatureMacros()
         QLatin1String("__cpp_nested_namespace_definitions"),
         QLatin1String("__cpp_noexcept_function_type"),
         QLatin1String("__cpp_nontype_template_args"),
+        QLatin1String("__cpp_nontype_template_parameter_auto"),
         QLatin1String("__cpp_nsdmi"),
         QLatin1String("__cpp_range_based_for"),
         QLatin1String("__cpp_raw_strings"),

src/tools/clangbackend/source/clangbackend_global.h

@@ -51,7 +51,7 @@ enum class PreferredTranslationUnit
 #  define IS_LIMITSKIPFUNCTIONBODIESTOPREAMBLE_SUPPORTED
 #endif
 
-// CLANG-UPGRADE-CHECK: Remove IS_SKIPWARNINGSFROMINCLUDEDFILES_SUPPORTED once we require clang >= 7.0
+// CLANG-UPGRADE-CHECK: Remove IS_SKIPWARNINGSFROMINCLUDEDFILES_SUPPORTED
 #if defined(CINDEX_VERSION_HAS_SKIPWARNINGSFROMINCLUDEDFILES_BACKPORTED)
 #  define IS_SKIPWARNINGSFROMINCLUDEDFILES_SUPPORTED
 #endif

tests/unit/unittest/tokenprocessor-test.cpp

@@ -1485,8 +1485,7 @@ TEST_F(TokenProcessor, PreprocessorInclusionDirectiveWithKeyword)
     ASSERT_THAT(infos[3], HasOnlyType(HighlightingType::StringLiteral));
 }
 
-// CLANG-UPGRADE-CHECK: Enable once https://bugs.llvm.org//show_bug.cgi?id=12972 is resolved.
-TEST_F(TokenProcessor, DISABLED_VariableInOperatorFunctionCall)
+TEST_F(TokenProcessor, VariableInOperatorFunctionCall)
 {
     const auto infos = translationUnit.tokenInfosInRange(sourceRange(566, 12));