[clang] [llvm] Add macro to suppress -Wunnecessary-virtual-specifier (PR #139614)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `bolt-x86_64-ubuntu-shared` running on `bolt-worker` while building `clang,llvm` at step 5 "build-bolt".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/151/builds/5818

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-bolt) failure: build (failure)
0.365 [2169/18/1] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/Demangle.cpp.o
0.465 [2168/18/2] Building CXX object lib/Demangle/CMakeFiles/LLVMDemangle.dir/DLangDemangle.cpp.o
0.510 [2167/18/3] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/ABIBreak.cpp.o
0.553 [2166/18/4] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/AArch64BuildAttributes.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/AArch64BuildAttributes.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fPIC -UNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/AArch64BuildAttributes.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/AArch64BuildAttributes.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/AArch64BuildAttributes.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/AArch64BuildAttributes.cpp
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/STLFunctionalExtras.h:19,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/StringRef.h:13,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/AArch64BuildAttributes.h:21,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/AArch64BuildAttributes.cpp:9:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/Compiler.h:719:40: error: missing binary operator before token "("
  719 | #if defined(__clang__) && __has_warning("-Wunnecessary-virtual-specifier")
      |                                        ^
0.663 [2166/17/5] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/ARMBuildAttributes.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/ARMBuildAttributes.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fPIC -UNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/ARMBuildAttributes.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/ARMBuildAttributes.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/ARMBuildAttributes.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/ARMBuildAttributes.cpp
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/ARMBuildAttributes.h:21,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/ARMBuildAttributes.cpp:9:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/Compiler.h:719:40: error: missing binary operator before token "("
  719 | #if defined(__clang__) && __has_warning("-Wunnecessary-virtual-specifier")
      |                                        ^
0.762 [2166/16/6] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/APSInt.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/APSInt.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fPIC -UNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/APSInt.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/APSInt.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/APSInt.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/APSInt.cpp
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/APInt.h:18,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/APSInt.h:18,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/APSInt.cpp:14:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/Compiler.h:719:40: error: missing binary operator before token "("
  719 | #if defined(__clang__) && __has_warning("-Wunnecessary-virtual-specifier")
      |                                        ^
0.797 [2166/15/7] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/AArch64AttributeParser.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/AArch64AttributeParser.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fPIC -UNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/AArch64AttributeParser.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/AArch64AttributeParser.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/AArch64AttributeParser.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/AArch64AttributeParser.cpp
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/AArch64AttributeParser.h:12,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/AArch64AttributeParser.cpp:10:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/Compiler.h:719:40: error: missing binary operator before token "("
  719 | #if defined(__clang__) && __has_warning("-Wunnecessary-virtual-specifier")
      |                                        ^
0.799 [2166/14/8] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/FormatVariadic.cpp.o
FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/FormatVariadic.cpp.o 
ccache /usr/bin/c++ -DGTEST_HAS_RTTI=0 -DLLVM_EXPORTS -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/build/include -I/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fPIC -UNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/FormatVariadic.cpp.o -MF lib/Support/CMakeFiles/LLVMSupport.dir/FormatVariadic.cpp.o.d -o lib/Support/CMakeFiles/LLVMSupport.dir/FormatVariadic.cpp.o -c /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/FormatVariadic.cpp
In file included from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/ErrorHandling.h:17,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/Hashing.h:50,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/ADT/ArrayRef.h:12,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/FormatVariadic.h:28,
                 from /home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/lib/Support/FormatVariadic.cpp:8:
/home/worker/bolt-worker2/bolt-x86_64-ubuntu-shared/llvm-project/llvm/include/llvm/Support/Compiler.h:719:40: error: missing binary operator before token "("
  719 | #if defined(__clang__) && __has_warning("-Wunnecessary-virtual-specifier")
      |                                        ^
0.852 [2166/13/9] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/APFixedPoint.cpp.o

```

</details>

https://github.com/llvm/llvm-project/pull/139614