Port 830e39ab

Original Commit Message:

    Wide suspends have a "wide" (or "extra-wide") bytecode at their offset,
    rather than the suspend itself, so they were failing the return check.

R=leszeks@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I0c95b9fd34df7232ae07fd1e508f40cd139e9734
Reviewed-on: https://chromium-review.googlesource.com/894303Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#50971}