BUG=v8:7295,v8:8562

Change-Id: Ifa02ba233967ba38d4ff43576de77738001d076a
Reviewed-on: https://chromium-review.googlesource.com/c/1450115Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59330}