Remove another outbreak of customized (and completely broken) hashing. This one is particularly annoying because the hashing algorithm is highly specialized, with a strange "equivalence" definition that subsets the fields involved.
Remove another outbreak of customized (and completely broken) hashing.
This one is particularly annoying because the hashing algorithm is
highly specialized, with a strange "equivalence" definition that subsets
the fields involved.

Still, this looks at the exact same set of data as the old code, but
without bitwise or-ing over parts of it and other mixing badness. No
functionality changed here. I've left a substantial fixme about the fact
that there is a cleaner and more principled way to do this, but it
requires making the equality definition actual stable for particular
types...

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@152218 91177308-0d34-0410-b5e6-96231b3b80d8

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