[PATCH] [Profile] Clang support for setting profile output from command line

[Teresa Johnson]

This change is the third of 3 patches to add support for specifying
the profile output from the command line via -fprofile-instr-generate=<path>,
where the specified output path/file will be overridden by the
LLVM_PROFILE_FILE environment variable.

This patch adds the necessary support to the clang frontend, and adds a
new test.

The first patch (compiler-rt) is committed:
  http://llvm.org/viewvc/llvm-project?view=revision&revision=236055
The second patch (llvm) is out for review:
  http://reviews.llvm.org/D9334

http://reviews.llvm.org/D9407

Files:
  include/clang/Driver/Options.td
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/Profile/c-generate.c

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