8993 regex: Refactor fast/slow stepping bits in the matching engine

Review Request #2315 — Created Sept. 19, 2019 and submitted — Latest diff uploaded

yuripv
illumos-gate
master
8993
2342, 2343
1bd069a...
general

From upstream commit:

Adding features for matching is fairly straightforward, but this requires
some duplication because of this fast/slow setup. They can be fairly
trivially combined into a single walk(), so do it to make future additions
less error prone.

regex tests

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