[PATCH] driver: enable -use-dwarf-debug-flags

[Saleem Abdulrasool]

As for the question on the size difference:

@dblakie, the overall build is nearly 1M larger (I forgot to measure the size of the binary itself, if thats what you were interested in).

http://reviews.llvm.org/D3166

Files:
  include/clang/Driver/ToolChain.h
  test/Driver/debug-flags.c
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