The `parameters` attached to FrameState nodes are often iterated s.t.
the receiver (implicitly at index 0), and potentially some leading
parameters, are skipped. The new convenience functions
`begin_without_receiver` and `begin_without_receiver_and_skip` make this
pattern more convenient.

Bug: chromium:1166136
Change-Id: Ic2bc7319edf9b8567346788dfaebd8852672a703
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2637221
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72211}