[llvm] [DataFlowSanitizer] Properly add ext attributes on arguments as needed. (PR #225443)

[Eli Friedman via llvm-commits]

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@@ -3164,10 +3213,18 @@ bool DFSanVisitor::visitWrappedCallBase(Function &F, CallBase &CB) {
     // Adds variable arguments.
     append_range(Args, drop_begin(CB.args(), FT->getNumParams()));
 
+    // Combine CallSite attributes with Function declaration attributes.
+    AttributeList CombinedAttrs = CI->getAttributes();
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efriedma-quic wrote:

The call attributes should probably also be computed as part of the getCustomFunctionType(), instead of trying to adjust later with transformFunctionAttributes().

https://github.com/llvm/llvm-project/pull/225443