* basic-block.h (redirect_edge_and_branch_force,
	redirect_edge_and_branch, block_label, forwarder_block_p): Declare.
	* flow.c (redirect_edge_and_branch_force,
	redirect_edge_and_branch, block_label, forwarder_block_p): Make global.
	(redirect_edge_and_branch_force): Fix copying of lifeness information.
	(block_label): Handle EXIT_BLOCK_PTR by returning NULL.
	* ifcvt.c (dead_or_predictable): Take BB as an new destionation
	instead of label; update CFG after transformation.
	(find_if_case_1): Update call, use redirect_edge_and_branch_force
	for finishing the transformation; handle even case where ELSE
	does not follow THEN.
	(find_if_case_2): Update call of dead_or_predictable; simplify
	CFG update.

	* emit-rtl.c (split_branch_probability): New global variable.
	(try_split): Take care to set split_branch_probability and
	create REG_BR_PROB note for new jump insns.
	* md.texi (define_split): Document new feature.

	* i386.c (ix86_split_fp_branch): Redistribute branch probability notes.

From-SVN: r44249