[PATCH] Validate C99 and C++03's set of UCNs

[Jordan Rose]

  Update to match changes in trunk.

  Also, add `LLVM_READONLY` to `isCharInSet`, although that should be fully inline-able anyway.

Hi rsmith,

http://llvm-reviews.chandlerc.com/D327

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D327?vs=794&id=931#toc

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticLexKinds.td
  lib/Lex/Lexer.cpp
  lib/Lex/UnicodeCharSets.h
  test/Preprocessor/ucn-allowed-chars.c
  test/Preprocessor/utf8-allowed-chars.c
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