predicates.md: Add cmp_op predicate.

predicates.md: Add cmp_op predicate.

2014-02-23  David Holsgrove <david.holsgrove@xilinx.com>

	* config/microblaze/predicates.md: Add cmp_op predicate.
	* config/microblaze/microblaze.md: Add branch_compare instruction
	which uses cmp_op predicate and emits cmp insn before branch.
	* config/microblaze/microblaze.c (microblaze_emit_compare): Rename
	to microblaze_expand_conditional_branch and consolidate logic.
	(microblaze_expand_conditional_branch): emit branch_compare
	insn instead of handling cmp op separate from branch insn.

From-SVN: r208055