Revert op[12]_range operators for PLUS_EXPR and MINUS_EXPR.

Revert the patch below until issues are resolved:

	commit 4287e816
	Author: Aldy Hernandez <aldyh@redhat.com>
	Date:   Wed Nov 9 01:00:57 2022 +0100

	    Implement op[12]_range operators for PLUS_EXPR and MINUS_EXPR.

	    We can implement the op[12]_range entries for plus and minus in terms
	    of each other.  These are adapted from the integer versions.

gcc/ChangeLog:

	* range-op-float.cc (class foperator_plus): Remove op[12]_range.
	(class foperator_minus): Same.