We track untagged values through the InterpreterFrameState, that allows
us to re-use already emitted CheckedSmiUntag and elide CheckedSmiTag
whenever the next node wants the untagged value as input.

It uses LoadRegisterTaggedValue, LoadRegisterSmiUntaggedValue and
accumulator variants as helper in the graph builder.

Spilled values can now be untagged, since we currently do not
support stack slot re-use, we use a ZoneVector to keep track of
the stack slot representation.

We tag (lazily) any value that will be passed as input to a Phi node.

Bug: v8:7700

Change-Id: I34cb69c8f1fbeb6a8158a251a4dd2e114e894ea0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3574559Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79939}