Test more ways of producing a positive infinity, and then test negative
infinity as well to prevent entropy leak; the usual suspects still fail
all tests.

Add a new regression test, which checks that we handle fp overflow correctly,
and produce a correct infinity.

Currently, this tests fails on 68060 (060sp is to blame) and 88100 processors,
and maybe

Add a new regression test, which checks that we handle fp overflow correctly,
and produce a correct infinity.

Currently, this tests fails on 68060 (060sp is to blame) and 88100 processors,
and maybe more.

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