[PATCH] Fix for #pragma warning to work correctly with "1-4:" specifiers

[Andrey Bokhanko]

Hi rnk, rsmith,

Bug fix for PR23577 (https://llvm.org/bugs/show_bug.cgi?id=23577#c0).

"1-4" specifiers are returned as numeric constants, not identifiers, and should be treated as such. Currently pragma handler incorrectly assumes that they are returned as identifiers.

http://reviews.llvm.org/D9856

Files:
  lib/Lex/Pragma.cpp
  test/Preprocessor/pragma_microsoft.c

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