Replacing pc with trampoline on stack
 
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: I8c0a2489de19e6d5fb4ebf1de7da1933726265b4
Reviewed-on: https://chromium-review.googlesource.com/596027
Commit-Queue: Juliana Patricia Vicente Franco <jupvfranco@google.com>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47066}