gcov-io.c (gcov_read_words): Don't call memmove if excess is 0.

	* gcov-io.c (gcov_read_words): Don't call memmove if excess is 0.
	* data-streamer-in.c (streamer_read_hwi): Shift UHWI 1 instead of
	HWI 1 and negate the unsigned value.
	* expmed.c (expand_sdiv_pow2): For modes wider than word always
	use AND instead of shift.
	* wide-int-print.cc (print_decs): Negate UHWI instead of HWI.
c-family/
	* c-ada-spec.c (dump_ada_nodes): Don't call qsort if 
	comments->count <= 1, as comments->entries might be NULL.

From-SVN: r212264