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deps: cherry-pick a814b8a from upstream V8

Rodrigo Muino Tomonari requested to merge github/fork/ofrobots/cr-666046 into v7.x-staging

deps: cherry-pick a814b8a from upstream V8

Original commit message:

Merged: [heap] Clear recorded slots for inobject properties when migrating fast object to slow mode.

Revision: a814b8aeaf2b56635054c96435972dce90576f62

BUG=chromium:666046 LOG=N NOTRY=true NOPRESUBMIT=true NOTREECHECKS=true R=ulan@chromium.org

Review URL: https://codereview.chromium.org/2549803002 .

Cr-Commit-Position: refs/branch-heads/5.5@{#60 (closed)} Cr-Branched-From: 3cbd5838bd8376103daa45d69dade929ee4e0092-refs/heads/5.5.372@{#1} Cr-Branched-From: b3c8b0ce2c9af0528837d8309625118d4096553b-refs/heads/master@{#40015}

R=@nodejs/v8

Chromium bug: https://bugs.chromium.org/p/chromium/issues/detail?id=666046. This is also needed on v6.x.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)

deps: V8

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