[PATCH] [Support] Beef up and expose the response file parsing in llvm::cl

[Reid Kleckner]

    - Minor review comments and return success, which no one will use yet.

Hi hans,

http://llvm-reviews.chandlerc.com/D1170

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1170?vs=2873&id=2883#toc

Files:
  include/llvm/Support/CommandLine.h
  lib/Support/CommandLine.cpp
  test/Other/ResponseFile.ll
  unittests/Support/CommandLineTest.cpp
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