Commits on May 25, 2021

1. Add alloc counter benchmark for result erasing maps. …

   Motivation:
   
   Peter thinks that result-erasing maps should not allocate, and we have
   special code paths in the code to try to make Void -> Void maps not
   allocate. Sadly, both code paths currently do allocate.
   
   Per our rules for not trying to make optimizations without data, we
   should start measuing these closures so we can make optimizations.
   
   Modifications:
   
   - Added an alloc couter test for result-erasing maps.
   
   Result:
   
   Alloc counter test suitable for any fix of apple#1697.

   

   Lukasa committed May 25, 2021
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