[CodeGen] Ignore debug uses in MachineCopyPropagation

Debug uses should not count as real uses, since the presence of debug
information could affect the generated code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336803 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed