 o Remove vm_map_growstack() and useracc() from sendsig().  Copyout() and    suword() will automatically grow the stack if needed.  o Add a comment that osigreturn() and sigreturn() are MPSAFE.
 o Remove vm_map_growstack() and useracc() from sendsig().  Copyout() and
   suword() will automatically grow the stack if needed.
 o Add a comment that osigreturn() and sigreturn() are MPSAFE.

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