[PATCH] [Profile] compiler-rt support for setting profile output from command line

[Teresa Johnson]

Re: [Profile] compiler-rt support for setting profile output from command line

Updated patch based on comments from Justin:

- Passing NULL to the filename setting interfaces now resets to default.profraw as

indicated in the header file description.

- Changed a couple of routine names to be clearer.
- New tests.


http://reviews.llvm.org/D9323

Files:
  lib/profile/InstrProfiling.h
  lib/profile/InstrProfilingFile.c
  test/profile/instrprof-override-filename-then-reset-default.c
  test/profile/instrprof-override-filename-with-env.c
  test/profile/instrprof-override-filename.c
  test/profile/instrprof-set-filename-then-reset-default.c

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