[PATCH] [Concepts] lex keywords: concept and requires

[Hubert Tong]

Hi rsmith, faisalv, fraggamuffin,

This patch enables lexing of `concept` and `requires` as keywords.
Further changes which add messages for future keyword compat are to
follow.

http://reviews.llvm.org/D10233

Files:
  include/clang/Basic/TokenKinds.def
  lib/Basic/IdentifierTable.cpp
  test/Lexer/keywords_test.cpp

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