[clang] [Clang][AArch64] Warn when calling streaming/non-streaming about vect… (PR #79842)

[Dinar Temirbulatov via cfe-commits]

================
@@ -12236,6 +12236,23 @@ bool Sema::CheckFunctionDeclaration(Scope *S, 
FunctionDecl *NewFD,
     bool UsesSM = NewFD->hasAttr<ArmLocallyStreamingAttr>();
     bool UsesZA = Attr && Attr->isNewZA();
     bool UsesZT0 = Attr && Attr->isNewZT0();
+
+    if (UsesSM) {
+      if (NewFD->getReturnType()->isSizelessVectorType())
+        Diag(NewFD->getLocation(),
+             diag::warn_sme_locally_streaming_has_vl_args_returns);
+      auto *FPT = NewFD->getType()->castAs<FunctionProtoType>();
----------------
dtemirbulatov wrote:

Done.

https://github.com/llvm/llvm-project/pull/79842
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