const testing.loopPoisonTimer

3 uses

	testing (current package)
		benchmark.go#L145: 		b.loop.i &^= loopPoisonTimer
		benchmark.go#L159: 		b.loop.i |= loopPoisonTimer
		benchmark.go#L507: 	loopPoisonTimer = uint64(1 << (63 - iota))

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