Fix for KtLightParameter and KtLightParameterList equality

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/KtLightParameter.java

@@ -185,4 +185,15 @@ public class KtLightParameter extends LightParameter implements KtLightDeclarati
     public boolean equals(Object obj) {
         return obj instanceof PsiElement && isEquivalentTo((PsiElement) obj);
     }
+
+    @Override
+    public int hashCode() {
+        KtParameter kotlinOrigin = getKotlinOrigin();
+        if (kotlinOrigin != null) {
+            return kotlinOrigin.hashCode();
+        }
+        else {
+            return 0;
+        }
+    }
 }

compiler/light-classes/src/org/jetbrains/kotlin/asJava/elements/KtLightParameterList.kt

@@ -45,4 +45,15 @@ class KtLightParameterList(
             visitor.visitParameterList(this)
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+        other as KtLightParameterList
+        if (parent != other.parent) return false
+        return true
+    }
+
+    override fun hashCode(): Int = parent.hashCode()
+
 }