Re-apply "[GVNHoist] Move GVNHoist to function simplification part of pipeline."

This reverts commit r296872 now that PR32153 has been fixed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300200 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed