stack ws workspace for pcre and others #1576

[Poul-Henning Kamp]

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I think moving pcre from stack to heap would hurt our performance
more than increasing the thread stack size.

What we really need is for pcre to tell us an estimate of how much
stack-space is needed during compilation of the REs, so that we
can refuse vcl.use if there isn't enough thread_stack for it.

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