[PATCH] Lex and ignore Microsoft's #pragma warning(...)

[Reid Kleckner]

Hi rsmith,

This fixes PR17145 and avoids unknown pragma warnings.

This change does not attempt to map MSVC warning numbers to clang
warning flags.  Perhaps in the future we will implement a mapping for
some common subset of Microsoft warnings, but for now we don't.

http://llvm-reviews.chandlerc.com/D1652

Files:
  include/clang/Basic/DiagnosticLexKinds.td
  include/clang/Lex/PPCallbacks.h
  lib/Frontend/PrintPreprocessedOutput.cpp
  lib/Lex/Pragma.cpp
  test/Lexer/pragma-operators.cpp
  test/Preprocessor/pragma_microsoft.c
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