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/ecma/base/ecma-globals.h

@@ -107,6 +107,7 @@ typedef enum
   ECMA_PARSE_HAS_STATIC_SUPER = (1u << 5), /**< the current context is a static class method */
   ECMA_PARSE_EVAL = (1u << 6), /**< eval is called */
   ECMA_PARSE_MODULE = (1u << 7), /**< module is parsed */
+  ECMA_PARSE_FUNCTION = (1u << 8), /**< a function body is parsed or the code is inside a function */
 } ecma_parse_opts_t;
 
 /**