Commits on Nov 9, 2018

1. deps: cherry-pick b87d408 from upstream V8 …

   Original commit message:
   
       [heap-profiler] Fix a use-after-free when snapshots are deleted
   
       If a caller starts the sampling heap profiler and takes a snapshot, and
       then deletes the snapshot before the sampling has completed, a
       use-after-free will occur on the StringsStorage pointer.
   
       The same issue applies for StartTrackingHeapObjects which shares the
       same StringsStorage object.
   
       Bug: v8:8373
       Change-Id: I5d69d60d3f9465f9dd3b3bef107c204e0fda0643
       Reviewed-on: https://chromium-review.googlesource.com/c/1301477
       Commit-Queue: Peter Marshall <petermarshall@chromium.org>
       Reviewed-by: Alexei Filippov <alph@chromium.org>
       Cr-Commit-Position: refs/heads/master@{#57114}
   
   Refs: v8/v8@b87d408

   

   psmarshall committed Nov 9, 2018
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