[clang] Make [[clang::lifetimebound]] work for expressions coming from default arguments (PR #112047)

[Richard Smith via cfe-commits]

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@@ -532,6 +533,11 @@ static void visitLocalsRetainedByReferenceBinding(IndirectLocalPath &Path,
     }
   } while (Init != Old);
 
+  if (auto *DAE = dyn_cast<CXXDefaultArgExpr>(Init)) {
+    Path.push_back({IndirectLocalPathEntry::DefaultArg, DAE, DAE->getParam()});
+    Init = DAE->getExpr();
+  }
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zygoloid wrote:

I think this should be in the loop above -- the default argument could itself contain one of the other expressions that we want to skip over.

https://github.com/llvm/llvm-project/pull/112047