combine.c (update_rsp_from_reg_equal): Only look for the nonzero bits of src in nonze...

combine.c (update_rsp_from_reg_equal): Only look for the nonzero bits of src in nonzero_bits_mode if...

2018-12-18  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* combine.c (update_rsp_from_reg_equal): Only look for the nonzero bits
	of src in nonzero_bits_mode if the mode of src is MODE_INT and
	HWI_COMPUTABLE.
	(reg_nonzero_bits_for_combine): Add clarification to comment.

From-SVN: r267227