[Bug regex/500] regex code can be optimized a lot

[bonzini@gnu.org]

-- 
Bug 500 depends on bug 507, which changed state.

Bug 507 Summary: using a dummy re_node_set causes a mild slowdown in regex
http://sources.redhat.com/bugzilla/show_bug.cgi?id=507

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

http://sources.redhat.com/bugzilla/show_bug.cgi?id=500

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