[PATCH] D125723: [MSVC] Add support for MSVC pragma optimize

[Stephen Long via Phabricator via cfe-commits]

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MSVC's pragma optimize turns optimizations on or off based on the list
passed. Depends on D125722 <https://reviews.llvm.org/D125722>.

>From MSVC's docs:
+-----------+-------------------------------------------------+

| Parameter | Type of optimization |
|

+-----------+-------------------------------------------------+

| g | Enable global optimizations. Deprecated |
|

+-----------+-------------------------------------------------+

| s or t | Specify short or fast sequences of machine code |
|

+-----------+-------------------------------------------------+

| y | Generate frame pointers on the program stack |
|

+-----------+-------------------------------------------------+

https://docs.microsoft.com/en-us/cpp/preprocessor/optimize?view=msvc-170


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125723

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Parse/Parser.h
  clang/include/clang/Sema/Sema.h
  clang/lib/Parse/ParsePragma.cpp
  clang/lib/Sema/SemaAttr.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/test/CodeGen/pragma-msvc-optimize.c
  clang/test/Preprocessor/pragma_microsoft.c

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