[SystemZ] Add compare-and-branch instructions to MC

This adds MC support for fused compare + indirect branch instructions,
ie. CRB, CGRB, CLRB, CLGRB, CIB, CGIB, CLIB, CLGIB. They aren't actually
generated yet -- this is preparation for their use for conditional
returns in the next iteration of D17339.

Author: koriakin
Differential Revision: http://reviews.llvm.org/D18742



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265296 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed