[llvm] Reland "[AArch64][SME] Port all SME routines to RuntimeLibcalls" (PR #153417)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> Compile-time: https://llvm-compile-time-tracker.com/compare.php?from=0a9ca5d7da1bf6111979b8076895162605108815&to=15320c11696064f3b2e9216fc58ace8fa425c68d&stat=instructions:u
> 
> This is a minor regression at `-O0`, but nothing like the original implementation.

Could you re-try this now that `TLI.getSupportedLibcallImpl` uses a static hash map?  Thanks!

https://github.com/llvm/llvm-project/pull/153417