[PATCH] D41780: Preserve unknown STDC pragma through preprocessor

[Steven Wu via Phabricator via cfe-commits]

steven_wu created this revision.
steven_wu added reviewers: efriedma, rsmith, arphaman.

should keep the unknown STDC pragma through preprocessor and we also
should not emit warning for unknown STDC pragma during preprocessor.

rdar://problem/35724351


Repository:
  rC Clang

https://reviews.llvm.org/D41780

Files:
  include/clang/Basic/DiagnosticLexKinds.td
  include/clang/Basic/DiagnosticParseKinds.td
  include/clang/Parse/Parser.h
  lib/Frontend/PrintPreprocessedOutput.cpp
  lib/Lex/Pragma.cpp
  lib/Parse/ParsePragma.cpp
  test/Preprocessor/pragma_unknown.c

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