Revert "[MergeICmps] Enable the MergeICmps Pass by default."

Breaks clang-ppc64be-linux-multistage buildbot.

This reverts commit 515bab711f308c2e8299c49dd8c84ea6a2e0b60e.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324319 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed