MFC r269744
 Run dtrace in 32-bit mode when compiling 32-bit libraries.
MFC r269642:
Add wrappers to assert that vm object is unlocked and for try upgrade.
MFC r269643:
Weaken the requirement for the vm object lock by only asserting locked
object in vm_pager_page_unswapped(), instead of locked exclusively.
MFC r269604:
- Implement fast interrupt handler to save CPU usage.
- Cleanup some register reads and writes to use existing register
  access macros.
- Ensure code which only applies to the control endpoint is not run
  for other endpoints in the data transfer path.
MFC r269566:
Fix for deadlock in USB device side mode.
MFC r269565:
Rename driver name a bit to avoid unit number confusion in dmesg.