const runtime.arenaL1Shift

3 uses

	runtime (current package)
		heapdump.go#L534: 			base := arenaBase(arenaIdx(i1)<<arenaL1Shift | arenaIdx(i))
		malloc.go#L292: 	arenaL1Shift = arenaL2Bits
		mheap.go#L639: 		return uint(i) >> arenaL1Shift