PR middle-end/38878
	* fold-const.c (fold_binary_loc) <case EQ_EXPR, NE_EXPR>: Add
	STRIP_NOPS on arg0 and arg1.  When optimizing X +- C == X
	and C - X == X also strip nops from +/-/p+ operand.
	When optimizing -X == C, fold C to arg0's type.

	* gcc.dg/tree-ssa/foldaddr-1.c: Remove xfail.

From-SVN: r170957