This enables lazy bytecode handler deserialization by default.

Design doc: http://goo.gl/QxZBL2

TBR=hablich@chromium.org

Bug: v8:6624
Change-Id: I89a17e16a4ee18ee1bfca75a1d61f7a11cdc211f
Reviewed-on: https://chromium-review.googlesource.com/776836Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49526}