InstrProf:  Turn on test for Linux

Enabling test/profile on Linux to get feedback from the buildbots.  I'm
hoping this just works...

<rdar://problem/16458307>

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@205319 91177308-0d34-0410-b5e6-96231b3b80d8