[Hexagon] Update kills in hexagon-nvj even more properly than before

Account for the fact that both, the feeder and the compare can be moved
over instructions that kill registers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306443 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed