This marks the InterpreterEntryTrampoline as isolate-independent. With
this change, all builtins are now embedded.

Slight changes were needed to how we deopt into the trampoline. We now
store the entry address within the Interpreter class instead of
embedding the builtin code target.

Bug: v8:7777
Change-Id: If781bf6f06cb2efbab1369ece757f04c343a1b38
Reviewed-on: https://chromium-review.googlesource.com/c/1337734Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57563}