Even in the embedded bytecode handler configuration, there's currently
no guarantee that all handlers are eager. Specifically, on ia32
handlers are currently not embedded and thus lazy.

We need to keep lazy deserialization logic around until that is no
longer the case.

Bug: v8:6624
Change-Id: Ie4ec5f0fcd9890ed96a5df3bf3654e85379f92ae
Reviewed-on: https://chromium-review.googlesource.com/1236261Reviewed-by: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56110}