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

[durin42 (Augie Fackler)]

durin42 added a comment.


  OOC, have you compared this with the hashbrown crate for perf?

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  rHG Mercurial

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

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

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Cc: durin42, kevincox, mercurial-devel