R=rossberg@chromium.org
BUG=chromium:575167

Review-Url: https://codereview.chromium.org/2630553002
Cr-Original-Original-Commit-Position: refs/heads/master@{#42286}
Committed: https://chromium.googlesource.com/v8/v8/+/fcc6e85ec6b01e5367795f98aff104b1ff23f619
Review-Url: https://codereview.chromium.org/2630553002
Cr-Original-Commit-Position: refs/heads/master@{#42315}
Committed: https://chromium.googlesource.com/v8/v8/+/74a2f9b7d3c3d9a9284ab8d5a9d08618b8194966
Review-Url: https://codereview.chromium.org/2630553002
Cr-Commit-Position: refs/heads/master@{#42350}