Switch T_SYSCALL to interrupt gate, call sti before syscall handling.
Switch T_SYSCALL to interrupt gate, call sti before syscall handling.

aclements/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,bowlofstew/sv6