BUG=v8:6261, v8:6278, v8:6344

Review-Url: https://codereview.chromium.org/2868343002
Cr-Original-Commit-Position: refs/heads/master@{#45236}
Committed: https://chromium.googlesource.com/v8/v8/+/55a610ba24c819ef24d0efbcc4d2e4a4f6a24baa
Review-Url: https://codereview.chromium.org/2868343002
Cr-Commit-Position: refs/heads/master@{#45259}