Move constant-sized bitvector to the stack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217600 91177308-0d34-0410-b5e6-96231b3b80d8
Add triple and remove hashes to account for buildbot differences in comment strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217601 91177308-0d34-0410-b5e6-96231b3b80d8