const runtime.summaryLevels

7 uses

	runtime (current package)
		mpagealloc.go#L75: 	summaryL0Bits    = heapAddrBits - logPallocChunkBytes - (summaryLevels-1)*summaryLevelBits
		mpagealloc.go#L202: 	summary [summaryLevels][]pallocSum
		mpagealloc.go#L978: 	logMaxPackedValue = logPallocChunkPages + (summaryLevels-1)*summaryLevelBits
		mpagealloc_64bit.go#L15: 	summaryLevels = 5
		mpagealloc_64bit.go#L33: var levelBits = [summaryLevels]uint{
		mpagealloc_64bit.go#L48: var levelShift = [summaryLevels]uint{
		mpagealloc_64bit.go#L60: var levelLogPages = [summaryLevels]uint{