aio: Remove obsolete IO worker ID references.
In an ancient ancestor of this code, the postmaster assigned IDs to IO
workers. Now it tracks them in an unordered array and doesn't know
their IDs, so it might be confusing to readers that it still referred to
their indexes as IDs.
No change in beha
aio: Remove obsolete IO worker ID references.
In an ancient ancestor of this code, the postmaster assigned IDs to IO
workers. Now it tracks them in an unordered array and doesn't know
their IDs, so it might be confusing to readers that it still referred to
their indexes as IDs.
No change in beha
