Add support for new.target (#3469)

Notable changes:
* Extracted the pure JS/builtin and external C method invocations
  into two new methods (`ecma_op_function_call_{simple, external}`).
* Updated parser/scanner to handle "new.target" correctly.
* Added JS test case.

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com

jerry-core/parser/js/byte-code.h

@@ -680,6 +680,8 @@
               VM_OC_EXT_RETURN | VM_OC_GET_STACK) \
   CBC_OPCODE (CBC_EXT_RETURN_PROMISE, CBC_NO_FLAG, -1, \
               VM_OC_RETURN_PROMISE | VM_OC_GET_STACK) \
+  CBC_OPCODE (CBC_EXT_PUSH_NEW_TARGET, CBC_NO_FLAG, 1, \
+              VM_OC_PUSH_NEW_TARGET | VM_OC_PUT_STACK) \
   \
   /* Last opcode (not a real opcode). */ \
   CBC_OPCODE (CBC_EXT_END, CBC_NO_FLAG, 0, \