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

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git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- clang/include/clang/AST/Decl.h clang/include/clang/AST/DeclCXX.h clang/include/clang/AST/DeclFriend.h clang/include/clang/AST/DeclOpenMP.h clang/include/clang/Driver/Action.h clang/include/clang/Sema/Sema.h clang/lib/AST/ByteCode/InterpFrame.h clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp clang/lib/CodeGen/CGStmtOpenMP.cpp clang/lib/Driver/ToolChains/Hexagon.h llvm/include/llvm/Analysis/InstSimplifyFolder.h llvm/include/llvm/Analysis/TargetFolder.h llvm/include/llvm/IR/ConstantFolder.h llvm/include/llvm/IR/NoFolder.h llvm/include/llvm/Support/Compiler.h llvm/include/llvm/Transforms/Scalar/GVNExpression.h llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp llvm/lib/Target/X86/X86InstrInfo.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
index 576fa55d8..b8cb77e1a 100644
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -714,10 +714,10 @@ void AnnotateIgnoreWritesEnd(const char *file, int line);
 /// This macro is used to adhere to LLVM's policy that each class with a vtable
 /// must have at least one out-of-line virtual function. This macro allows us
 /// to declare such a function in `final` classes without triggering a warning.
-#define LLVM_DECLARE_VIRTUAL_ANCHOR_FUNCTION() \
-  _Pragma("clang diagnostic push") \
-  _Pragma("clang diagnostic ignored \"-Wunnecessary-virtual-specifier\"") \
-  virtual void anchor()\
-  _Pragma("clang diagnostic pop")
+#define LLVM_DECLARE_VIRTUAL_ANCHOR_FUNCTION()                                 \
+  _Pragma("clang diagnostic push")                                             \
+      _Pragma("clang diagnostic ignored "                                      \
+              "\"-Wunnecessary-virtual-specifier\"") virtual void              \
+      anchor() _Pragma("clang diagnostic pop")
 
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https://github.com/llvm/llvm-project/pull/139614