[X86] Preserve memory refs when folding loads into divides.

This is similar to what we already do for multiplies. Without this we can't unfold and hoist an invariant load.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317732 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed