[llvm] [RISCV] Combine (addi (addi)) and add post riscv-opt-w-instrs machine-combiner (PR #171165)

[Craig Topper via llvm-commits]

topperc wrote:

Have you looked at the impact across other workloads? I'm bit concerned about adding another run of a pass if this isn't a common issue.

https://github.com/llvm/llvm-project/pull/171165