[clang] [clang] Improve diagnostic on [[nodiscard]] attribute (PR #112521)

[Erich Keane via cfe-commits]

================
@@ -1616,22 +1616,24 @@ QualType CallExpr::getCallReturnType(const ASTContext 
&Ctx) const {
   return FnType->getReturnType();
 }
 
-const Attr *CallExpr::getUnusedResultAttr(const ASTContext &Ctx) const {
+std::pair<const NamedDecl *, const Attr *>
+CallExpr::getUnusedResultAttr(const ASTContext &Ctx) const {
+  // If the callee is marked nodiscard, return that attribute
+  const Decl *D = getCalleeDecl();
----------------
erichkeane wrote:

We should document this inversion in the release notes.This is more than just 
changing the name, it is preferring the `callee` decl here instead of the 
return type.  this is at least notable.

https://github.com/llvm/llvm-project/pull/112521
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