[RFC] Possible PCT performance improvements.

[chromatic]

On Saturday 14 August 2010 at 16:38, Patrick R wrote:

> If/when the opcode is added, I'll gladly fix up NQP and the regex engine
> to take advantage of it.  Ideally I'd like something like:
> 
>     $I0 = substreq $S0, $S1, $I1

I added substr_eq_at on the substr_eq_at branch; updates to NQP and the regex 
engine there (as well as benchmarks) very welcome.

-- c