const runtime.timeHistSubBucketBits

4 uses

	runtime (current package)
		histogram.go#L54: 	timeHistSubBucketBits   = 4
		histogram.go#L55: 	timeHistNumSubBuckets   = 1 << timeHistSubBucketBits
		histogram.go#L97: 		superBucket = uint(sys.Len64(uint64(duration))) - timeHistSubBucketBits
		histogram.go#L148: 			superBucketMin = uint64(1) << uint(i-1+timeHistSubBucketBits)

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