Fix up hash functions for datetime datatypes so that they don't take

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 7af3a6fc6f9e2486df37eeac0d61addba09a3551
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-07-06T04:16:00Z
Releases: 8.3.0
Fix up hash functions for datetime datatypes so that they don't take
unwarranted liberties with int8 vs float8 values for these types.
Specifically, be sure to apply either hashint8 or hashfloat8 depending
on HAVE_INT64_TIMESTAMP.  Per my gripe of even date.

Files