Revert r362676 "[Profile]: Add runtime interface to specify file handle for profile data."

This caused instrumented Clang to become crashy. See llvm-commits thread
for repro steps.

This also reverts follow-up r362716 which added test cases.

> Author: Sajjad Mirza
>
> Differential Revision: http://reviews.llvm.org/D62541

llvm-svn: 363134