make test does not find segfaults
Never send in a patch without perl harness run
See, I didn't catch that pat.t, regexep.t segfaulted. perl harness found it. It was a bug because regcomp makes a new PMOP for PL_reg_curpm and I forgot to allocate a entry on the pad for it. That is now fixed.
Now I just have to fix the reallocation of regexpad entries when regexes are deleted. And add relevant cleanup stuff to perl_destruct.