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

[kevincox (Kevin Cox)]

kevincox added a comment.


  In D7116#104617 <https://phab.mercurial-scm.org/D7116#104617>, @durin42 wrote:
  
  > OOC, have you compared this with the hashbrown crate for perf?
  
  std::collections::HashMap now uses hashbrown https://blog.rust-lang.org/2019/07/04/Rust-1.36.0.html

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  https://phab.mercurial-scm.org/D7116

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Cc: durin42, kevincox, mercurial-devel