solve the pcre stack overflow #1576 - was: stack vs workspace for pcre and others

[Poul-Henning Kamp]

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I have done what I belive I can do about PCRE/recursion/stack before the 4.1-R.

I looked into making JIT a parameter, but it would require me to
either change the VRE API or add a gross out-of-band hack, which I
don't want to do at this time.

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