* gimple-ssa-isolate-paths.c (check_loadstore): Mark discovered
	memory references as volatile.
	(insert_trap_and_remove_trailing_statements): Fix comment.

	* gcc.dg/tree-ssa/isolate-1.c: Update expected output.
	* gcc.dg/tree-ssa/isolate-5.c: Verify the load survives through
	the SSA optimizers.

From-SVN: r204722