[llvm] [RISCV] Zabha/Zacas implies Zaamo (PR #115694)

[Craig Topper via llvm-commits]

topperc wrote:

> LGTM. IIUC, there should be no compatibility issue since both of these two extensions are new?

Zabha was added to binutils 8 months ago. Zacas was added 5 months ago. Not sure if there was a release in between.

https://github.com/llvm/llvm-project/pull/115694