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/parser/js/jsp-mm.cpp

@@ -92,7 +92,7 @@ jsp_mm_recommend_size (size_t minimum_size) /**< minimum required size */
 void*
 jsp_mm_alloc (size_t size) /**< size of block to allocate */
 {
-  void *ptr_p = mem_heap_alloc_block (size, MEM_HEAP_ALLOC_SHORT_TERM);
+  void *ptr_p = mem_heap_alloc_block (size + sizeof (jsp_mm_header_t), MEM_HEAP_ALLOC_SHORT_TERM);
 
   jsp_mm_header_t *tmem_header_p = (jsp_mm_header_t*) ptr_p;