const runtime.spanAllocHeap

9 uses

	runtime (current package)
		arena.go#L953: 	h.initSpan(s, spanAllocHeap, spc, base, userArenaChunkPages)
		mheap.go#L940: 	spanAllocHeap          spanAllocType = iota // heap span
		mheap.go#L948: 	return s != spanAllocHeap
		mheap.go#L968: 		s = h.allocSpan(npages, spanAllocHeap, spanclass)
		mheap.go#L1356: 	if typ == spanAllocHeap {
		mheap.go#L1364: 	case spanAllocHeap:
		mheap.go#L1566: 		h.freeSpanLocked(s, spanAllocHeap)
		mheap.go#L1621: 	if typ == spanAllocHeap {
		mheap.go#L1627: 	case spanAllocHeap: