Move swapout code into vm_swapout.c.

[kib]

Summary

There is no NO_SWAPPING #ifdef left in the code.

Test Plan

Compile-tested only ATM. Both !NO_SWAPPING and NO_SWAPPING configs.

[markj]

Looks ok to me. I like this approach better than, e.g., ffs_softdep.c, where the stubs are kept in the same file.

sys/vm/vm_swapout_dummy.c

72

Extra newline.

[kib]

Remove empty line.
Do not ever return from NO_SWAPPING swapper().