[llvm] [RISCV] Set a barrier between mask producer and user of V0 (PR #114012)

[Philip Reames via llvm-commits]

preames wrote:

> Yes, as what I can see, I have to admit that this patch seems to be a compromise.

I'm fine with this patch as long as we know what we're working around.  :)

https://github.com/llvm/llvm-project/pull/114012