[clang] [clang][clang-cl] Add -fms-preprocessor-compat and support /Zc:preprocessor (PR #167200)

[Corentin Jabot via cfe-commits]

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@@ -3238,6 +3238,10 @@ def fms_compatibility : Flag<["-"], "fms-compatibility">, Group<f_Group>,
   Visibility<[ClangOption, CC1Option, CLOption]>,
   HelpText<"Enable full Microsoft Visual C++ compatibility">,
   MarshallingInfoFlag<LangOpts<"MSVCCompat">>;
+def fms_preprocessor_compat : Flag<["-"], "fms-preprocessor-compat">, Group<f_Group>,
+  Visibility<[ClangOption, CC1Option]>,
+  HelpText<"Enable full emulation of the traditional MSVC preprocessor">,
+  MarshallingInfoFlag<LangOpts<"MSVCPreprocessor">>;
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cor3ntin wrote:

Can we use  `ImpliedByAnyOf<[fms_extensions.KeyPath]>;` here

https://github.com/llvm/llvm-project/pull/167200