   0  new_with_vtable <rpython.jit.backend.llsupport.descr.SizeDescr object at 0x100ae658910> -> %r0
   4  residual_call_ir_i $<* fn _ll_1_raw_malloc_varsize__Signed>, I[%i0], R[], <CallDescr(i) EF=5 OS_RAW_MALLOC_VARSIZE_CHAR> -> %i0
  12  -live- %i0, %r0
  12  setfield_gc_i %r0, %i0, FieldDescr<rpython.rtyper.lltypesystem.lltype.ScopedAlloc_Array of Char .inst_buf>
  17  ref_return %r0
