[PATCH 1/2] IEEE-754R 2008 nextUp/nextDown implementation: tcDecrement

[Michael Gottesman]

The attached patch is the first in a series of 2 patches which implement IEEE-754R 2008 nextUp/nextDown via the function APFloat::next.

This first patch implements the static function tcDecrement on APInt which decrements a bignum represented by a part count and an integerPart and returns the borrow flag. Unittests are included as well.

Please Review,
Michael

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