[llvm] [RISCV] Initial ISel support for the experimental zacas extension (PR #67918)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> Please hold off on working on this patch. I'd like to experiment with a different way to do this.

Apologies for the delay. It would be good if you have a better solution :)
I am currently working on regressions caused by recent middle-end patches, so I don't have enough bandwidth to deal with RISCV-related patches.


https://github.com/llvm/llvm-project/pull/67918