Reviewed by Eric Seidel.
https://bugs.webkit.org/show_bug.cgi?id=22131 Factor out visited link hashing and types into a new file, LinkHash. This also changes the hash type to 64 bits, but does not actually use the extra bits yet. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@38661 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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