We expect no GC between the call to UnwindAndFindHandler and
the call to that handler. We can precalculate the handler entrypoint
and then let the CEntryStub just load and call that address.

The main motivation for this change is the wasm on the native heap
work, and making the CEntryStub able to work with non- Code* values.

Bug: v8:6876
Change-Id: I660f29619edc315afbb537ef3df018865fab7ba4
Reviewed-on: https://chromium-review.googlesource.com/744723
Commit-Queue: Mircea Trofin <mtrofin@chromium.org>
Reviewed-by: Brad Nelson <bradnelson@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49084}