The emitter writes "; scriptc-entry" before the entry module's top-level
function (its %init). In modules of fewer than 32 partitions, the helper
places the roots that hold a marked function first, and their partitions
take no other root. A root that finds no partition with room goes to the
first open partition from its own.
An edit of the program's top level then recompiles only the top-level code
and the chain that follows it, not the other roots that balancing placed
beside it.
Chris Tate
31a9be23a4