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

[Sander de Smalen via cfe-commits]

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@@ -3501,9 +3501,16 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
   return false;
 }
 
+static bool hasStreamingModeChangeInABI(const FunctionDecl *FD) {
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sdesmalen-arm wrote:

nit:
```suggestion
static bool hasArmStreamingInterface(const FunctionDecl *FD) {
```

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