re-land [ExpandMemCmp] Split ExpandMemCmp from CodeGen into its own pass."

Fix undefined references: ExpandMemCmp belongs to CodeGen/, not Scalar/.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317318 91177308-0d34-0410-b5e6-96231b3b80d8
16 files changed