This adds support for the LZRF/LZRG/LLZRGF instructions that were
added on z13, and uses them for code generation were appropriate.
SystemZDAGToDAGISel::tryRISBGZero is updated again to prefer LLZRGF
over RISBG where both would be possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286586 91177308-0d34-0410-b5e6-96231b3b80d8
Ulrich Weigand