Remove all the special-case code for INT64_IS_BUSTED, per decision that

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

Commit: 901be0fad4034c9cf8a3588fd6cf2ece82e4b8ce
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-01-07T04:53:35Z
Releases: 9.0.0
Remove all the special-case code for INT64_IS_BUSTED, per decision that
we're not going to support that anymore.

I did keep the 64-bit-CRC-with-32-bit-arithmetic code, since it has a
performance excuse to live.  It's a bit moot since that's all ifdef'd
out, of course.

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