RegExp refactoring and improvements

Move RegExp bytecode functions to a separate file.
Optimize bytecode lenght on character matching.
Implement a basic RegExp cache to optimize memory
usage on duplicated RegExp in JS files. Also fix
minor style issues and add missing comments. Improve
existing comments.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

jerry-core/jerry.c

@@ -1655,9 +1655,9 @@ jerry_cleanup (void)
 
   bool is_show_mem_stats = ((jerry_flags & JERRY_FLAG_MEM_STATS) != 0);
 
+  vm_finalize ();
   ecma_finalize ();
   lit_finalize ();
-  vm_finalize ();
   mem_finalize (is_show_mem_stats);
 } /* jerry_cleanup */