Also change the method for allocating them. Instead of two possible
alloc calls from different places, just ensure they are allocated at the
start of each slice. This should be simpler and less bug-prone than the
previous method.

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

It is read-only in this code.

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

All the variables modified by this code are either per-MB arrays or have
been moved to the per-slice context

Use a local variable instead.