Commits on Aug 22, 2020

1. Optimize Cop#relevant_rubocop_rspec_file? …

   The result of `rspec_pattern` is always the same (because it is based
   on the configuration file), so there is no need to re-calculate it every
   time it is called.
   
   I tried memozing on the Cop instance, but at least when running the
   specs, we instantiate Cop way too often. Memoizing on the class level
   reduces the number of calculations to once per `Cop` subclass we have.
   If we allowed using class variables (`@@rspec_pattern`) we could reduce
   the number of calculations to one.
   
   This commit reverts 995b4fe and adds
   memoization in a class instance variable.

   

   bquorning committed Aug 22, 2020
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