... in order to avoid creating an OsrHelper during code assembly,
because its constructor accesses the heap.

Bug: v8:6048
Change-Id: I3bf592a5a0f91752a9f5ec35982f962445512bb7
Reviewed-on: https://chromium-review.googlesource.com/530370
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45990}