[llvm] [RISCV][VLOPT] Add support for mask-register logical instructions and set mask instructions (PR #112231)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> Do we support propagating from a mask instruction to a compare instruction like vmseq?

I have a patch for that in my local, but we currently return Unknown for it to stop propagation.

https://github.com/llvm/llvm-project/pull/112231