[llvm] [RISCV][POC] Should we be using ADD for disjoint or? (PR #155669)

[Philip Reames via llvm-commits]

preames wrote:

I realized we already propagated the disjoint flag into MI, and have put up an alternate patch which is much more localized in test impact.  See: https://github.com/llvm/llvm-project/pull/156044

> Do you have measurements for code size savings?

Nope, this was based on a random observation.  

> are there cases where we could potentially leverage ADDW?

This one is tricky if we move to the late scheme.  We don't have an ORW, so we basically have to do this eagerly in ISEL.  

https://github.com/llvm/llvm-project/pull/155669