2018-06-07  Paul Koning  <ni1d@arrl.net>

gcc/

	* compare-elim.c (try_merge_compare): Don't merge compare if
	address contains a side effect.
	(try_eliminate_compare): Likewise.

gcc/testsuite/

	* gcc.c-torture/compile/20180605-1.c: New test.

From-SVN: r261287