* basic-block.h (update_br_prob_note): Declare.
	* cfgcleanup.c (try_simplify_condjump): Call update_br_prob_note.
	(try_forward_edges): Care negative frequencies and update note.
	(outgoing_edges_match): Tweek conditional merging heuristics.
	(try_crossjump_to_edge): use update_br_prob_note.
	* cfglayout.c (fixup_reorder_chain): Likewise.
	* cfrtl.c (update_br_prob_note): New.
	* ifcvt.c (dead_or_predicable): Call update_br_prob_note.

	* i386.c (ix86_decompose_address): Return -1 if address contains
	shift.
	(legitimate_address_p): Require ix86_decompose_address to return 1.

	* gcse.c (hash_scan_set): Use CONSTANT_INSN_P.
	(cprop_insn): Likewise.

From-SVN: r48750