JDK-7079317 : Incorrect branch's destination block in PrintoOptoAssembly output
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Save/restore label and block in scratch_emit_size(). MachBranchNode was added as base class for MachIfNode, MachGotoNode and MachNullCheckNode. The only problem was JumpX mach node which is subclass of MachConstantNode. But it is fine since it does not have label, short version or delay slot (the sparc instruction has delay slot but we use ialu_reg_reg pipe_class). It needs only one additional check in output.cpp where Kill projections are processed.