D7116: rust-performance: introduce FastHashMap type alias for HashMap

[kevincox (Kevin Cox)]

kevincox added a comment.


  In D7116#104769 <https://phab.mercurial-scm.org/D7116#104769>, @Alphare wrote:
  
  > The following comparison shows that for input > 20 bytes, fnv has worse overall performance than xx
  
  Sounds good. We can always do benchmarks in the future and swap it.

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To: Alphare, #hg-reviewers, kevincox
Cc: durin42, kevincox, mercurial-devel