The old logic only decremented `remaining_prelink_tasks` if `bin_file`
was not `null`. This meant that on `-fno-emit-bin` builds with
registered prelink tasks (e.g. C source files), we exited from
`Compilation.performAllTheWorkInner` early, assuming a prelink error.

Instead, when `bin_file` is `null`, we still decrement
`remaining_prelink_tasks`; we just don't do any actual work.

Resolves: #22682