[PATCH] D132810: [clang][MinGW] Add `-mguard=cf` and `-mguard=cf-nochecks`

[Alvin Wong via Phabricator via cfe-commits]

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This option can be used to enable Control Flow Guard checks and
generation of address-taken function table. They are equivalent to
`/guard:cf` and `/guard:cf,nochecks` in clang-cl. Passing this flag to
the Clang driver will also pass `--guard-cf` to the MinGW linker.

This feature is disabled by default. The option `-mguard=none` is also
available to explicitly disable this feature.

Depends on D132808 <https://reviews.llvm.org/D132808>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132810

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/MinGW.cpp
  clang/lib/Driver/ToolChains/MinGW.h
  clang/test/Driver/mingw-cfguard.c

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