const runtime.gcDrainUntilPreempt

5 uses

	runtime (current package)
		mgc.go#L1980: 				gcDrain(&pp.gcw, gcDrainUntilPreempt|gcDrainFlushBgCredit)
		mgc.go#L2001: 				gcDrain(&pp.gcw, gcDrainFractional|gcDrainUntilPreempt|gcDrainFlushBgCredit)
		mgc.go#L2003: 				gcDrain(&pp.gcw, gcDrainIdle|gcDrainUntilPreempt|gcDrainFlushBgCredit)
		mgcmark.go#L953: 	gcDrainUntilPreempt gcDrainFlags = 1 << iota
		mgcmark.go#L987: 	preemptible := flags&gcDrainUntilPreempt != 0