This patch serializes the machine basic block successors. It uses a YAML flow sequence that contains
strings that have the MBB references. The MBB reference strings use the same syntax as MBB machine
operands in the machine instruction strings.
body: - id: 0 name: entry successors: [ '%bb.1.less', '%bb.2.exit' ] - id: 1 name: less - id: 2 name: exit