[m-rev.] diff: make some bitwise tests' .exp files more readable

[Zoltan Somogyi]

This prepares for the addition of <<u and >>u.

Note that bitwise_[u]int.m have .exp2 files as well, for 32 bit systems,
which this diff does not update. Tomorrow, I will see whether my current
setup has a 32-bit version of gcc I can use to force Mercury to pretend
it is running on a 32 bit machine :-)

Zoltan.
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