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

[via llvm-commits]

Him188 wrote:

@davemgreen Does the updated solution solves your concerns? I will polish it if we are on the right way.

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