[clang] [clang][SME] Ignore flatten/clang::always_inline statements for callees with mismatched streaming attributes (PR #116391)

[Benjamin Maxwell via cfe-commits]

MacDue wrote:

Note: I've extended this PR to cover the clang-only `[[clang::always_inline]]` statement attribute (which is currently broken for streaming functions too). It's documentation is more relaxed than the GNU `__attribute__((always_inline))` attribute (which says failing to inline is an error) -- relevant snippets included above.

https://github.com/llvm/llvm-project/pull/116391