Implement ES2015 class feature (part II.) (#2439)

This patch is the second milestone of the implementation of this new language element.

Supported:
 - Single class inheritance
 - Functionality of 'super' keyword
 - Implicit constructor in class heritage
 - Specific behaviour while extending with the built-in 'Array' or '%TypedArray%' object
 - Abstract subclasses (Mix-ins)

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/vm/vm-stack.c

@@ -26,6 +26,9 @@
  * @{
  */
 
+JERRY_STATIC_ASSERT (PARSER_WITH_CONTEXT_STACK_ALLOCATION == PARSER_SUPER_CLASS_CONTEXT_STACK_ALLOCATION,
+                     parser_with_context_stack_allocation_must_be_equal_to_parser_super_class_context_stack_allocation);
+
 /**
  * Abort (finalize) the current stack context, and remove it.
  *
@@ -64,6 +67,9 @@ vm_stack_context_abort (vm_frame_ctx_t *frame_ctx_p, /**< frame context */
       /* FALLTHRU */
     }
     case VM_CONTEXT_WITH:
+#ifndef CONFIG_DISABLE_ES2015_CLASS
+    case VM_CONTEXT_SUPER_CLASS:
+#endif /* !CONFIG_DISABLE_ES2015_CLASS */
     {
       ecma_object_t *lex_env_p = frame_ctx_p->lex_env_p;
       frame_ctx_p->lex_env_p = ecma_get_lex_env_outer_reference (lex_env_p);