[PATCH] Add CommentOptions, allow specifying custom comment block commands

[Ben Gertzfield]

    - Rebase from trunk.
    - Fix style nits from @doug.gregor (thanks so much for taking a look!)

Hi doug.gregor, indygreg, gribozavr,

http://llvm-reviews.chandlerc.com/D272

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D272?vs=885&id=1045#toc

Files:
  include/clang/AST/CommentCommandTraits.h
  include/clang/Basic/CommentOptions.h
  include/clang/Basic/LangOptions.h
  include/clang/Driver/Options.td
  lib/AST/ASTContext.cpp
  lib/AST/CommentCommandTraits.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/ASTUnit.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Serialization/ASTReader.cpp
  lib/Serialization/ASTWriter.cpp
  test/Driver/fcomment-block-commands.c
  test/Index/comment-custom-block-command.cpp
  unittests/AST/CommentLexer.cpp
  unittests/AST/CommentParser.cpp
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