func internal/runtime/gc/scan.ScanSpanPackedReference

one use

	internal/runtime/gc/scan (current package)
		scan_reference.go#L21: func ScanSpanPackedReference(mem unsafe.Pointer, bufp *uintptr, objMarks *gc.ObjMask, sizeClass uintptr, ptrMask *gc.PtrMask) (count int32) {