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/lexer.h

@@ -169,9 +169,7 @@ typedef struct
  */
 #define TOKEN_EMPTY_INITIALIZER {0, TOK_EMPTY, 0}
 
-void lexer_init (bool);
-void lexer_init_source (const char *, size_t);
-void lexer_free (void);
+void lexer_init (const char *, size_t, bool);
 
 token lexer_next_token (void);
 void lexer_save_token (token);