Disable the bits of r211623 that broke the bots

Part of my test seems to rely on iterator bits that I didn't implement,
at least in the gcc bots. Disabling while I investigate.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211625 91177308-0d34-0410-b5e6-96231b3b80d8