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Make `iFresh` faster

Robbert Krebbers requested to merge ci/robbert/faster_iFresh into master

This MR makes sure that no evidence related to calls to iFresh is recorded in the proof term.

It's an alternative to the approach by @jtassaro in !224 (closed). Instead of using a let-binding in the context for the counter, this MR changes the sealing of envs_entails so the counter can be changed using just the conversion rule. The advantage of this approach is that no additional information is printed to the user.

This MR gives a 3.48% speedup on lambdarust, see here. This is in the same ballpark as @jtassaro's version, which gives a 3.33% speedup on lambdarust, see here.

Edited by Robbert Krebbers

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