[clang] [AArch64][SME] Fix bug on SMELd1St1 (PR #118109)

[via cfe-commits]

wwwatermiao wrote:

> It would be good to land this and get this cherry-picked onto the release/19.x branch. Any objection in merging this @wwwatermiao?

Thank you for mentioning this，I think that all the branch would have this problem. While this is my first time merge a request so is this necessary to merge onto all branch? I thought that this fix will automatically pull from main to other branch at some tiime.

https://github.com/llvm/llvm-project/pull/118109