re PR middle-end/85974 (Failure to optimize difference of two pointers into a compile time constant)

2018-07-13  Richard Biener  <rguenther@suse.de>

	PR middle-end/85974
	* match.pd (addr1 - addr2): Allow either of the operand to
	have a conversion.

	* gcc.c-torture/compile/930326-1.c: Adjust to cover widening.

From-SVN: r262632