[Patch] Internal functions for testsuite in regex

[Tim Shen]

This is based on disscusions
here(http://gcc.gnu.org/ml/libstdc++/2013-10/msg00034.html)

And it successfully find a bug in regex_executor.tcc :)

Booted and tested under -m32, -m64 and debug before the change in
regex_executor.tcc;
-m32 and -m64 only for regex_executor.tcc, but I'll start a bootstrap now.

Thanks!


-- 
Tim Shen
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