Port the remaining tests from:
https://chromium-review.googlesource.com/c/v8/v8/+/1227974/1/test/mjsunit/harmony/regexp-property-emoji-flag-sequence-generated.js#9

Bug: v8:7467
Change-Id: Ib187c93cb38befbbba31bdf93a0f5d8f1bee3d13
Reviewed-on: https://chromium-review.googlesource.com/1230098Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56083}