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

tests/jerry/regression-test-issue-280.js

@@ -13,9 +13,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-try {
-  eval('v_0 = {0: delete 3. instanceof foo() ^ {} }');
-  assert(false);
-} catch (e) {
-  assert(e instanceof ReferenceError);
+function check_reference_error (s) {
+  try {
+    eval (s);
+    assert (false);
+  } catch (e) {
+    assert (e instanceof ReferenceError);
+  }
 }
+
+check_reference_error ('v_0 = {0: delete 3. instanceof foo() ^ {} }');