[clang] [clang][SME] Emit error for OpenMP captured regions in SME functions (PR #124590)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

In theory, handling streaming mode doesn't seem too challenging here: you mark the outlined functions locally_streaming, and you're done, I think.  That said, I'm not sure how you define the semantics for ZA, so maybe better to just forbid everything SME-related.

https://github.com/llvm/llvm-project/pull/124590