[PATCH] Option parsing: support case-insensitive option matching.

[Rui Ueyama]

  - Moved StrCmpOptionName to OptTable.h to remove very similar (and confusing) two functions defined in OptTable.cpp and OptParserEmitter.cpp.

Hi hans,

http://llvm-reviews.chandlerc.com/D1485

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1485?vs=3756&id=3770#toc

Files:
  include/llvm/Option/OptParser.td
  include/llvm/Option/OptTable.h
  lib/Option/OptTable.cpp
  unittests/Option/OptionParsingTest.cpp
  unittests/Option/Opts.td
  utils/TableGen/OptParserEmitter.cpp
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