[SystemZ]  Update kill-flag in splitMove().

EarlierMI needs to clear the kill flag on the first operand in case of a store.

Review: Ulrich Weigand

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301177 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed