[PATCH] Use more range-based for loops

[Douglas Katzman]

Hi silvas,

And add Arg::getValues method with const 'this' and const result.

As requested by Sean Silva in http://reviews.llvm.org/D10689 but split out for separate review.

http://reviews.llvm.org/D10738

Files:
  include/llvm/Option/Arg.h
  lib/Driver/Driver.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp

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