... as well as more string constants.

Bug: v8:7790

Change-Id: I850f25ddbdbe58892b780e9bc21a7b6c3978bef0
Reviewed-on: https://chromium-review.googlesource.com/1219024
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55848}