[PATCH] Generalize future keyword compat diagnostics

[Hubert Tong]

Hi rsmith, faisalv, fraggamuffin,

In preparation for the introduction of more new keywords in the
implementation of the C++ language, generalize the support for future
keyword compat diagnostics (e.g., `diag::warn_cxx11_keyword`) by
extending the applicability of the relevant property in
##IdentifierTable## with appropriate renaming.

The code in the preprocessor which generates `diag::warn_cxx11_keyword`
is updated to choose an appropriate message based on the TokenKind
database, which has in turn been modified for easy selection of the
relevant keywords.

http://reviews.llvm.org/D9750

Files:
  include/clang/Basic/IdentifierTable.h
  include/clang/Basic/TokenKinds.def
  lib/Basic/IdentifierTable.cpp
  lib/Lex/Preprocessor.cpp

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