* fold-const.c (fold): Revert 2004-02-25 change.  Use the original
	operands to build a tree with swapped operands.
	* expr.c (expand_expr_real) <MAX_EXPR>: Consistently use the
	'unsignedp' predicate to specify the signedness.

Co-Authored-By: Roger Sayle <roger@eyesopen.com>

From-SVN: r78558