Add a new StackFrame class for unoptimized frames (which are either
interpreted or baseline). BaselineFrame becomes a subclass of this
rather than InterpretedFrame, and the various frame constants helpers
are similarly amended.

Bug: v8:11420, v8:11429
Change-Id: I87e9368aef48ef06a39476bf826f379ce1441528
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2692208
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72743}