The meaning of ZERO_EXTRACT depends on BITS_BIG_ENDIAN, not on
BYTES_BIG_ENDIAN.  This caused PR68814.


2015-12-11  Segher Boessenkool  <segher@kernel.crashing.org>

	PR rtl-optimization/68814
	* rtlanal.c (set_noop_p): Use BITS_BIG_ENDIAN instead of
	BYTES_BIG_ENDIAN.

From-SVN: r231547