[range-ops] Add frange& argument to rv_fold.

The floating point version of rv_fold returns its result in 3 pieces:
the lower bound, the upper bound, and a maybe_nan bit.  It is cleaner
to return everything in an frange, thus bringing the floating point
version of rv_fold in line with the integer version.

This first patch adds an frange argument, while keeping the current
functionality, and asserting that we get the same results.  In a
follow-up patch I will nuke the now useless 3 arguments.  Splitting
this into two patches makes it easier to bisect any problems if any
should arise.

gcc/ChangeLog:

	* range-op-float.cc (range_operator::fold_range): Pass frange
	argument to rv_fold.
	(range_operator::rv_fold): Add frange argument.
	(operator_plus::rv_fold): Same.
	(operator_minus::rv_fold): Same.
	(operator_mult::rv_fold): Same.
	(operator_div::rv_fold): Same.
	* range-op-mixed.h: Add frange argument to rv_fold methods.
	* range-op.h: Same.

0 files changed, 0 insertions, 0 deletions