[webkit-reviews] review requested: [Bug 55873] Use HashMaps for caching primitive values : [Attachment 84939] use HashMaps instead of fixed size arrays for caching

[bugzilla-daemon at webkit.org]

Antti Koivisto <koivisto at iki.fi> has asked  for review:
Bug 55873: Use HashMaps for caching primitive values
https://bugs.webkit.org/show_bug.cgi?id=55873

Attachment 84939: use HashMaps instead of fixed size arrays for caching
https://bugs.webkit.org/attachment.cgi?id=84939&action=review

------- Additional Comments from Antti Koivisto <koivisto at iki.fi>
This removes the fixed per-document cost of empty cache (was ~10kb on 32bit) 
while also somewhat improving caching efficiency (~5% from expanded integer
range which more than pays for itself). Caches usually cover only a fraction of
possible values so increased per-item cost from the hash table is ok.