[PATCH] Option parsing: allow alias arguments

[Hans Wennborg]

  New patch. Please take a look!

Hi rnk, Bigcheese,

http://llvm-reviews.chandlerc.com/D1245

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1245?vs=3100&id=3108#toc

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