[llvm] [IR] Do not inherit ABI attributes from the callee (PR #207173)

[Eli Friedman via llvm-commits]

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@@ -842,6 +842,28 @@ bool Attribute::canUseAsRetAttr(AttrKind Kind) {
   return hasAttributeProperty(Kind, AttributeProperty::RetAttr);
 }
 
+bool Attribute::isABIAttr(AttrKind Kind) {
+  switch (Kind) {
+  case Attribute::ByRef:
+  case Attribute::ByVal:
+  case Attribute::InAlloca:
+  case Attribute::InReg:
+  case Attribute::Nest:
+  case Attribute::NoExt:
+  case Attribute::Preallocated:
+  case Attribute::SExt:
+  case Attribute::StackAlignment:
+  case Attribute::StructRet:
+  case Attribute::SwiftAsync:
+  case Attribute::SwiftError:
+  case Attribute::SwiftSelf:
+  case Attribute::ZExt:
+    return true;
+  default:
+    return false;
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efriedma-quic wrote:

I'd prefer to list out the attributes here, so attributes don't accidentally default to non-ABI.

https://github.com/llvm/llvm-project/pull/207173