[llvm] [AArch64][GISel] Support SVE with 128-bit min-size for G_LOAD and G_STORE (PR #92130)

[via llvm-commits]

Him188 wrote:

> You cannot use `legalForTypesWithMemDesc` for legalizing scalable vector loads?

I intended to reduce the manual permutation of the scalable vector types. We also need to check whether ST supports such vector sizes. 

Since I have already generated `ScalableVecTypes` based on ST capabilities, I decided to reuse that information. Will it be better if I generate rules for `legalForTypesWithMemDesc` instead?


https://github.com/llvm/llvm-project/pull/92130