   0  residual_call_irf_f $<* fn clock>, I[], R[], F[], <CallDescr() EF=5> -> %f0
   8  -live- %f0
   8  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x100455287d0> -> %r0
  12  setfield_gc_f %r0, %f0, FieldDescr<pypy.objspace.std.floatobject.W_FloatObject.inst_floatval>
  17  ref_return %r0
