[PATCH] Option parsing: allow alias arguments

[Hans Wennborg]

Hi rnk, Bigcheese,

This patch makes option aliases more powerful by enabling them to pass along arguments to the option they're aliasing.

For example, if we have a joined option "-foo=", we can now specify a flag "-bar" to be an alias of that, with the argument "baz".

This is especially useful for the cl.exe compatible clang driver, where many options are aliases. For example, this patch would enable us to alias "/Ox" to "-O3" (-O is a joined option), and "/WX" to "-Werror" (again, -W is a joined option).

Please take a look.

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

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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