Revert "(refs/bisect/bad) GVN-hoist: enable by default"

GVN-Hoist appears to miscompile llvm-testsuite
SingleSource/Benchmarks/Misc/fbench.c at the moment.

I filed http://llvm.org/PR28880

This reverts commit r277786.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277909 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed