[PATCH] [clang] PR21195: Emit .gcno files to the proper location.

[Dan Albert]

I've added a test with a relative -o path, but there's still plenty of
uncovered ground here. For example, I can't verify that the default case
emits the .gcno file to the CWD (since it's an absolute path by the time is
reaches FileCheck, and afaik there's no way to tell FileCheck what the CWD
is).
Add an additional test with a relative -o path.

http://reviews.llvm.org/D5697

Files:
  lib/Driver/Tools.cpp
  test/Driver/clang_f_opts.c
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