[clang] [llvm] [AArch64][SME] Disable inlining of callees with new ZT0 state (PR #121338)

[Benjamin Maxwell via llvm-commits]

MacDue wrote:

> > LGTM 👍 You could maybe add a test to `clang/test/CodeGen/AArch64/sme-inline-callees-streaming-attrs.c` too (which tests `flatten`/`always_inline` statements).
> 
> Thanks for approving the changes! I did already add some tests to sme-inline-callees-streaming-attrs.c using `__arm_new("zt0")` in the latest commit, I can add more if there is something I've missed though?

Oh sorry, I must have missed it on my look over the patch earlier :sweat_smile: Looks ready to land to me :+1: 

https://github.com/llvm/llvm-project/pull/121338