Parser optimizations.

- parser is now non-recursive (i.e. parse function is not called recursively in any case);
 - byte-code is now more compact:
    - constants are now not immediately dumped upon occurence, but later - where necessary;
    - assignments are combined with unary / binary operations;
    - binary operations are encoded more compactly in many cases;
 - byte-code arrays are now allocated separately for each scope (so, GC of the scopes now becomes possible);
 - byte-code is dumped directly into corresponding byte-code arrays:
   - linked lists of op_meta are not now used for main code of a scope.

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

jerry-core/jerry-internal.h

@@ -38,8 +38,7 @@ jerry_is_abort_on_fail (void);
 typedef struct
 {
   uint32_t lit_table_size; /**< size of literal table */
-  uint32_t bytecode_size; /**< size of instructions array */
-  uint32_t idx_to_lit_map_size; /** size of idx-to-lit map */
+  uint32_t scopes_num; /**< number of saved bytecode pieces in the snapshot */
   uint32_t is_run_global : 1; /**< flag, indicating whether the snapshot
                                *   was dumped as 'Global scope'-mode code (true)
                                *   or as eval-mode code (false) */
@@ -48,6 +47,6 @@ typedef struct
 /**
  * Jerry snapshot format version
  */
-#define JERRY_SNAPSHOT_VERSION (1u)
+#define JERRY_SNAPSHOT_VERSION (2u)
 
 #endif /* !JERRY_INTERNAL_H */