Temporarily revert r328404:

commit 519b97132a4c960e8dedbfe4290d86970d92e995
Author: Richard Trieu <rtrieu@google.com>
Date:   Sat Mar 24 00:52:44 2018 +0000

    [ODRHash] Support pointer and reference types.

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@328404 91177308-0d34-0410-b5e6-96231b3b80d8

As it's breaking some tests. I've communicated with Richard offline about testcases.

llvm-svn: 329001