Cleaning up stable branch

git-svn-id: https://llvm.org/svn/llvm-project/polly/branches/google@214803 91177308-0d34-0410-b5e6-96231b3b80d8
Updating branches/google/stable to r214475

git-svn-id: https://llvm.org/svn/llvm-project/polly/branches/google@214811 91177308-0d34-0410-b5e6-96231b3b80d8