compile: add fast path for c_char #658
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This fixes a pretty bad performance bug in the NFA compiler. In particular, c_char was implemented by diverting to c_class, which is correct, but rather costly to do for every single character in a regex. This causes way more things than necessary to go through the class compilation infrastructure, which includes the suffix caching. We fix this by just special casing c_char. This speeds up regex compilation in #657 by around 30%. Fixes #657
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This fixes a pretty bad performance bug in the NFA compiler. In
particular, c_char was implemented by diverting to c_class, which is
correct, but rather costly to do for every single character in a regex.
This causes way more things than necessary to go through the class
compilation infrastructure, which includes the suffix caching.
We fix this by just special casing c_char. This speeds up regex
compilation in #657 by around 30%.
Fixes #657