[llvm] [RISCV] Optimize (slli (srli (slli X, C1), C1), C2) -> (srli (slli X, C1), C1-C2) (PR #119567)

[Craig Topper via llvm-commits]

topperc wrote:

> > Don't force push unless you really need to.
> 
> Sorry! In this PR I have precommit tests as suggested by https://llvm.org/docs/InstCombineContributorGuide.html How to edit it without a force push?

Oh. That's probably a good reason to force push.

https://github.com/llvm/llvm-project/pull/119567