expmed.c (extract_bit_field): Reverse operands of && condition to prevent a potential division by zero in the...

	* expmed.c (extract_bit_field): Reverse operands of && condition to
        prevent a potential division by zero in the previously first branch.
	* config/pa/pa.md (extv, extzv): FAIL if the bitfield length is zero.

From-SVN: r65907