This CL is the follow up of https://chromium-review.googlesource.com/c/586707/
which used to crash when running the gc-stress bots. 
It seems to be working now. We now keep the trampoline PC in the Safepoint 
table and use that information to find SafepointEntries.

There's some refactoring that can be done, such as changing the code for 
exceptions in a similar way and removing the trampoline from the 
DeoptimizationInputData. Will take care of this in the next CL.

Bug: v8:6563
Change-Id: I02565297093620023a1155b55d76a4dafcb54794
Reviewed-on: https://chromium-review.googlesource.com/593622
Commit-Queue: Juliana Patricia Vicente Franco <jupvfranco@google.com>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47030}