[clang] [clang] Emit @llvm.assume before streaming_compatible functions when the streaming mode is known (PR #121917)

[Sander de Smalen via cfe-commits]

================
@@ -1275,6 +1279,31 @@ bool 
AArch64TargetCodeGenInfo::wouldInliningViolateFunctionCallABI(
          GetArmSMEInlinability(Caller, Callee) != ArmSMEInlinability::Ok;
 }
 
+void AArch64TargetCodeGenInfo::emitFunctionCallProlog(
+    CGBuilderTy &Builder, const FunctionDecl *Caller,
+    const FunctionDecl *Callee) const {
+  const AArch64ABIInfo &ABIInfo = getABIInfo<AArch64ABIInfo>();
+  const TargetInfo &TI = ABIInfo.getContext().getTargetInfo();
+
+  if (!TI.hasFeature("sme"))
+    return;
+
+  if (!Callee || !isStreamingCompatible(Callee))
----------------
sdesmalen-arm wrote:

Can Caller be `nullptr` too?

https://github.com/llvm/llvm-project/pull/121917
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