We add a field `IsOutlined` to indicate whether a MachineFunction is outlined and set it true for outlined functions in MachineOutliner. For outlined functions, its live-outs are not complete so we don't run MCP on them. This is a fix for D146037.

We add a field `IsOutlined` to indicate whether a MachineFunction is outlined and set it true for outlined functions in MachineOutliner.

We add a field `IsOutlined` to indicate whether a MachineFunction is outlined and set it true for outlined functions in MachineOutliner. For outlined functions, its live-outs are not complete so we don't run MCP on them. This is a fix for D146037.