[m-rev.] diff: common.m improvement

[Ralph Becket]

Zoltan Somogyi, Wednesday, 20 April 2005:
> compiler/common.m:
> 	Allow the equality test for types succeed even for types that cannot
> 	be deconstructed, such as the ones for typeclassinfos. This allows
> 	common.m to a slightly better job of detecting common cells. This
> 	diff yields an improvement of about 0.5% in speed and 0.2% in
> 	executable size.

Looks good.
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