[clang] [clang][sema][FMV] Forbid multi-versioning arm_streaming functions. (PR #81268)

[Jon Roelofs via cfe-commits]

================
@@ -3501,9 +3501,18 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, 
StringRef AttrStr) {
   return false;
 }
 
+static bool isArmStreaming(const FunctionDecl *FD) {
+  if (FD->hasAttr<ArmLocallyStreamingAttr>())
+    return true;
----------------
jroelofs wrote:

Oh, you're right, we don't need this one, since the ABI isn't different from a 
normal function: 
https://arm-software.github.io/acle/main/acle.html#changing-streaming-mode-locally

https://github.com/llvm/llvm-project/pull/81268
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