Commits on May 2, 2021

1. [Zerocoin][Validation] Cache checksum heights …

   Validating zerocoin spends requires determining the height of an
   accumulator hash, which is done by searching through all the blocks
   in the chain starting from genesis, for every txin.
   
   Since the height of a particular hash-denomination pair is not going
   to change, we can cache it. This is most useful for in-wallet block
   template generation, since each mining thread performs these
   validations separately (while holding cs_main).
   
   Adds a SimpleLRUCache template based on 7c9e97a and uses it to
   store checksum heights. I chose a particular size for it that should
   be large enough for significant spends.
   
   This results in a roughly 30+x speedup of zerocoin spend validation
   (26-30ms/txin -> 0.4-0.9ms/txin). Vastly improves Veil-Project#862 alongside Veil-Project#915.

   

   Zannick committed May 2, 2021
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