Added conformance test

Author: Arthur Ozga

tests/cases/conformance/classes/classDeclarations/classAbstractKeyword/classAbstractInstantiations1.ts

@@ -6,6 +6,7 @@ class B extends A {}
 abstract class C extends B {}
 
 new A;
+new A(1); // should report 1 error
 new B;
 new C;