This doubles the size of the snapshot since it creates all of the
handlers twice (and it doesn't use any of these new ones). However it's
all behind a flag.

For now all bytecode handlers are marked as being not Isolate
independent to prevent snapshot creation failures.

Bug: v8:8068
Change-Id: Id49f521445643d9fc6b141353f0a29b585160e10
Reviewed-on: https://chromium-review.googlesource.com/1185100
Commit-Queue: Dan Elphick <delphick@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55411}