Port 895c3219

Original Commit Message:

    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.

R=jupvfranco@google.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I9871d110dcf7e390cf5fb2819ae1fa159c58ae84
Reviewed-on: https://chromium-review.googlesource.com/598768
Commit-Queue: Jaideep Bajwa <bjaideep@ca.ibm.com>
Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#47092}