[PATCH] Add a diagnostic for PS4 pragma comment

[Yunzhong Gao]

Hi,
PS4 target recognizes the #pragma comment() syntax as in -fms-extensions, but only handles the
case of #pragma comment(lib). This patch adds a warning if any other arguments are encountered.

This patch also refactors the code in ParsePragma.cpp a little bit to make it more obvious that some
codes are being shared between -fms-extensions and PS4 target.

Could someone kindly take a look at the patch?
- Gao

http://reviews.llvm.org/D8432

Files:
  include/clang/Basic/DiagnosticParseKinds.td
  lib/Parse/ParsePragma.cpp
  test/CodeGen/pragma-comment.c
  test/Preprocessor/pragma_ps4.c

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