   0  inline_call_ir_i <JitCode 'umask'>, I[%i0], R[] -> %i0
   7  -live- %i0
   7  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x100951d1e10> -> %r0
  11  setfield_gc_i %r0, %i0, FieldDescr<pypy.objspace.std.intobject.W_IntObject.inst_intval>
  16  ref_return %r0
