GVN-hoist: enable by default

As we addressed all compilation time problems with GVN-hoist
https://llvm.org/bugs/show_bug.cgi?id=28670
this patch turns GVN-hoist back by default.

Differential Revision: https://reviews.llvm.org/D23136

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277685 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed