[PM] Add GVNSink to the pipeline.

With this, the two pipelines should be in sync again (modulo
LoopUnswitch, but Chandler is actively working on that).

Differential Revision:  https://reviews.llvm.org/D33810

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304671 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed