Pull Up/Extract Super: Support members declared in the companion object of the original class

compiler/frontend/src/org/jetbrains/kotlin/psi/KtNamedDeclarationStub.java

@@ -139,4 +139,17 @@ abstract class KtNamedDeclarationStub<T extends KotlinStubWithFqName<?>> extends
         }
         return KtNamedDeclarationUtil.getFQName(this);
     }
+
+    @Override
+    public void delete() throws IncorrectOperationException {
+        KtClassOrObject classOrObject = KtPsiUtilKt.getContainingClassOrObject(this);
+
+        super.delete();
+
+        if (classOrObject instanceof KtObjectDeclaration
+            && ((KtObjectDeclaration) classOrObject).isCompanion()
+            && classOrObject.getDeclarations().isEmpty()) {
+            classOrObject.delete();
+        }
+    }
 }