[PATCH] D37899: [SystemZ] Implement shouldCoalesce() to help regalloc to avoid running out of registers with GR128 regs

[Ulrich Weigand via Phabricator via llvm-commits]

uweigand accepted this revision.
uweigand added a comment.
This revision is now accepted and ready to land.

Given that:

- Quentin approved the interface change
- The SystemZ parts now look good to me
- We have performance runs confirming this does not introduce regressions

this patch now LGTM.


https://reviews.llvm.org/D37899