const runtime.numSpanClasses

4 uses

	runtime (current package)
		mcache.go#L45: 	alloc [numSpanClasses]*mspan // spans to allocate from, indexed by spanClass
		mgcsweep.go#L60: 	numSweepClasses            = numSpanClasses * 2
		mheap.go#L199: 	central [numSpanClasses]struct {
		mheap.go#L558: 	numSpanClasses = _NumSizeClasses << 1

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)
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