JS: introduce CallToObjectDefineProperty::getAPropertyAttribute

javascript/ql/src/Declarations/DeadStoreOfProperty.ql

@@ -157,6 +157,11 @@ where
     or
     // exclude result from accessor declarations
     assign1.getWriteNode() instanceof AccessorMethodDeclaration
+  ) and
+  // exclude results from non-value definitions from `Object.defineProperty`
+  (
+    assign1 instanceof CallToObjectDefineProperty implies
+    assign1.(CallToObjectDefineProperty).getAPropertyAttribute().getPropertyName() = "value"
   )
 select assign1.getWriteNode(),
   "This write to property '" + name + "' is useless, since $@ always overrides it.",