[llvm] [RISCV] Remove `AND` mask generated by `( zext ( atomic_load ) )` by replacing the load with `zextload` for orderings not stronger then monotonic. (PR #136502)

[Jan Górski via llvm-commits]

janagor wrote:

> LGTM

Thanks @topperc. I don’t have commit access, can you merge this PR for me?

https://github.com/llvm/llvm-project/pull/136502