(*From Cminorgenproof*)
Remark val_inject_function_pointer:
  forall v fd j tv,
  Genv.find_funct ge v = Some fd ->
  globalfunction_ptr_inject j ->
  val_inject j v tv ->
  tv = v.

Lemma builtin_implements_preserved: forall id sg vargs vres, builtin_implements ge id sg vargs vres -> builtin_implements tge id sg vargs vres.