const runtime.memoryLimitMinHeapGoalHeadroom

3 uses

	runtime (current package)
		mgcpacer.go#L70: 	memoryLimitMinHeapGoalHeadroom = 1 << 20
		mgcpacer.go#L1086: 	if headroom < memoryLimitMinHeapGoalHeadroom {
		mgcpacer.go#L1089: 		headroom = memoryLimitMinHeapGoalHeadroom