re PR target/65117 (xtensa: With -Os, invalid parameter c1 for reg_class_subset_p() to cause segment fault.)

       PR target/65117
        * config/xtensa/xtensa.md (zero_cost_loop_start): Reverse numbering
        of operand 0 and operand 2.
        (zero_cost_loop_end, loop_end): Similarly.

From-SVN: r220953