compiler: Add `update_record` instruction.

This instruction updates several tuple fields at once, improving
on the old `setelement/3 + set_tuple_element` method in the
following ways:

* Eliminates BIF call overhead, the tuple is copied and updated
  inline.
* Doesn't require special treatment in the validator.
* Uses heap allocations in the same manner as `put_tuple2` and
  friends.
* When all fields are updated with the same value (runtime check),
  we can set `Dst=Src` and move on with our day. This is impossible
  with `set_tuple_element` as it requires a new copy every time
  to avoid creating illegal references from the old heap to the
  new heap.

0 files changed, 0 insertions, 0 deletions