flag re_compile should affect all predicates with regexes

[kamahen]

Currently only re_match/{2,3} is goal expanded when the re_compile flag is set; other predicates such as re_matchsub should compiled in a similar fashion.

Note that the re_compile flag is because the caching of compiled regexes (using table/1 directives) is relatively slow, due to the tabling taking into consideration both the regex and the options list.