Modify the -join-globalcopies option (off by default).

Always coalesce in forward order to propagate rematerialization.
I'm fixing this option so I can enable it by default soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184568 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed