Make the vmx asm code dtrace-fbt-friendly by
 - inserting frame enter/leave sequences
 - restructuring the vmx_enter_guest routine so that it subsumes
   the vm_exit_guest block, which was the #vmexit RIP and not a
   callable routine.

Reviewed by:	neel
MFC after:	3 weeks
Add support for the 'rdseed' instruction.
Note my mentors in the committers graph.
Add my birthday to the calendar.

Approved by:	bcr (mentor)