Clean up by_pieces_ninsns

Clean up by_pieces_ninsns

The by pieces compare can be implemented by overlapped operations. So
it should be taken into consideration when doing the adjustment for
overlap operations.  The mode returned from
widest_fixed_size_mode_for_size is already checked with mov_optab in
by_pieces_mode_supported_p called by widest_fixed_size_mode_for_size.
So it is no need to check mov_optab again in by_pieces_ninsns.  The
patch fixes these issues.

gcc/
	* expr.cc (by_pieces_ninsns): Include by pieces compare when
	do the adjustment for overlap operations.  Replace mov_optab
	checks with gcc assertion.