Revert "Switch to use RSCompilerDriver."

This reverts commit fef9a1b0b772034b4f0894d1e2b29d1115617be0.

Conflicts:

	lib/ExecutionEngine/RSCompiler.cpp

Change-Id: Ic6f3a3643e286a20799e1c7f03dee5d6c3683fef
23 files changed