[llvm] [AArch64][GISel] Fold G_SHL used by multiple G_PTR_ADD into load/store addressing mode (PR #96603)

[David Green via llvm-commits]

davemgreen wrote:

I will have to check the details, but yeah I think this looks decent. It would be good to have a .ll test file that tests various cases with GISel and SDAG run lines to check that they are folding at the same times.

https://github.com/llvm/llvm-project/pull/96603