ifcvt.c (struct noce_if_info): Add a Boolean b_unconditional field.

ifcvt.c (struct noce_if_info): Add a Boolean b_unconditional field.

	* ifcvt.c (struct noce_if_info): Add a Boolean b_unconditional field.
	(noce_try_sign_mask): Tweak rtx_cost check if t is evaluated anyway.
	(noce_process_if_block): Initialize if_info.b_unconditional if insn_b
	is currently executed unconditionally, i.e. not in "else_bb".

From-SVN: r84172