[Patch] Implement regex_match and regex_search

[Tim Shen]

...finally.

This patch complete flags specifed in [28.5]. However, `optimize` and
`match_any` are ignored. `format_*` are unimplemented yet.

regex_iterator and regex_token_iterator should work now, but need more
testcases.

Next, format string and and regex_replace should be worked on.

Now I just test -m64; I'll do a full bootstrap & test before committing.

Thanks!


-- 
Tim Shen
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