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/ecma/builtin-objects/ecma-builtin-regexp.c

@@ -46,6 +46,7 @@
  * Handle calling [[Call]] of built-in RegExp object
  *
  * @return ecma value
+ *         Returned value must be freed with ecma_free_value.
  */
 ecma_value_t
 ecma_builtin_regexp_dispatch_call (const ecma_value_t *arguments_list_p, /**< arguments list */
@@ -58,6 +59,7 @@ ecma_builtin_regexp_dispatch_call (const ecma_value_t *arguments_list_p, /**< ar
  * Handle calling [[Construct]] of built-in RegExp object
  *
  * @return ecma value
+ *         Returned value must be freed with ecma_free_value.
  */
 ecma_value_t
 ecma_builtin_regexp_dispatch_construct (const ecma_value_t *arguments_list_p, /**< arguments list */
@@ -152,4 +154,4 @@ ecma_builtin_regexp_dispatch_construct (const ecma_value_t *arguments_list_p, /*
  * @}
  */
 
-#endif /* CONFIG_ECMA_COMPACT_PROFILE_DISABLE_REGEXP_BUILTIN */
+#endif /* !CONFIG_ECMA_COMPACT_PROFILE_DISABLE_REGEXP_BUILTIN */