[clang] [clang][SME] Rework streaming mode always_inline errors/warnings (PR #174608)

[Sander de Smalen via cfe-commits]

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@@ -2370,6 +2370,13 @@ class FunctionDecl : public DeclaratorDecl,
     FunctionDeclBits.IsInstantiatedFromMemberTemplate = Val;
   }
 
+  bool bodyContainsNonStreamingSafeExpression() const {
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sdesmalen-arm wrote:

nit: it's not directly clear to me whether "NonStreamingSafe" means "safe for a non-streaming function" , or whether it means "not safe for a streaming function".

https://github.com/llvm/llvm-project/pull/174608