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

[Rui Ueyama]

  - Address shankarke's comment.

Hi rnk, hans,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1485?vs=3825&id=3831#toc

BRANCH
  ignore-case

ARCANIST PROJECT
  llvm

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