Borrow annotations for non-external declarations

[Kha]

Would help with eliding unnecessary inc/decs for e.g. ReaderT arguments

lean_object *l_Lean_Elab_Term_Do_ToCodeBlock_concatWith(
    lean_object *x_1, lean_object *x_2, lean_object *x_3, lean_object *x_4,
    lean_object *x_5, lean_object *x_6, lean_object *x_7, lean_object *x_8,
    lean_object *x_9, lean_object *x_10) {
_start : {
  if (lean_obj_tag(x_2) == 0) {
    lean_object *x_11;
    lean_dec(x_9);
    lean_dec(x_8);
    lean_dec(x_7);
    lean_dec(x_6);
    lean_dec(x_5);
    lean_dec(x_4);
    lean_dec(x_3);
    x_11 = lean_alloc_ctor(0, 2, 0);
    lean_ctor_set(x_11, 0, x_1);
    lean_ctor_set(x_11, 1, x_10);
    return x_11;
...

[leodemoura]

This is a must-have feature. It is part of the (now delayed) compiler refactoring project.