[SystemZ]  Use tablegen loops in SchedModels

NFC changes to make scheduler TableGen files more readable, by using loops
instead of a lot of similar defs with just e.g. a latency value that changes.

https://reviews.llvm.org/D49598
Review: Ulrich Weigand, Javed Abshar

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337909 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed