[llvm] [RISCV] Fold `addi` into load / store even if they are in different BBs. (PR #67024)

[Craig Topper via llvm-commits]

topperc wrote:

Tests?

Isn't `CodeGenPrepare::optimizeMemoryInst` supposed to move GEPs to their uses?

Does this increase register pressure? 

https://github.com/llvm/llvm-project/pull/67024