MFC 270850,271053,271192,271717:

MFC 270850,271053,271192,271717:
Save and restore FPU state across suspend and resume on i386.
- Create a separate structure for per-CPU state saved across suspend and
  resume that is a superset of a pcb.
- Store the FPU state for suspend and resume in the new structure
  (for amd64, this moves it out of the PCB)
- On both i386 and amd64, all of the FPU suspend/resume handling is now
  done in C.

Approved by:	re (hrs)

git-svn-id: svn://svn.freebsd.org/base/stable/10@271999 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f