[llvm] [clang] [Clang][SME] Detect always_inline used with mismatched streaming attributes (PR #77936)

[Sander de Smalen via cfe-commits]

sdesmalen-arm wrote:

> > Separately, it's probably worth ensuring that the LLVM inlining passes don't actually perform illegal inlining for functions marked always_inline; looking at the code, it looks like we might end up skipping the relevant checks.
> 
> The `TargetTransformInfo::areInlineCompatible` function in llvm makes these checks.

I think that Eli's point is that at the moment `areInlineCompatible` is not being called when using `always_inline`, which is something that needs changing.

https://github.com/llvm/llvm-project/pull/77936