r197972 - Support and use token kinds as diagnostic arguments

[Faisal Vali]

Hi Alp,
    This patch prevents clang from compiling in VS2010 (which supports
strong enums) - that's because forward declared enums (which are being used
in Diagnostic.h) aren't supported till VS2013.

Below, LLVM_HAS_STRONG_ENUMS is being used to assume support for forward
declared enums:

#if LLVM_HAS_STRONG_ENUMS
  namespace tok {
  enum TokenKind : unsigned;
  }
#endif


See: http://msdn.microsoft.com/en-us/library/vstudio/hh567368.aspx

Thanks!

Faisal Vali
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