Support syntax error feedback in parser.

Now, parser correctly finishes parse procedure if syntax of source code is incorrect (syntax correctness is indicated using return value):
 - parser-internal memory management is performed using jsp_mm_alloc / jsp_mm_free;
 - upon detection of incorrect syntax, all parser-allocated memory regions are deallocated using jsp_mm_free_all and parse finishes with corresponding return value.

JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com

jerry-core/jerry.h

@@ -49,7 +49,6 @@ typedef enum
 {
   ERR_OUT_OF_MEMORY = 10,
   ERR_SYSCALL = 11,
-  ERR_PARSER = 12,
   ERR_UNIMPLEMENTED_CASE = 118,
   ERR_FAILED_INTERNAL_ASSERTION = 120
 } jerry_fatal_code_t;