Replace by inline constants with separators (single quotes) for better
readability.

R=mlippautz@chromium.org

Bug: v8:10506
Change-Id: Iae7c72eeb9d463c63c2d135f6236edc6821d1e63
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2297379
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68939}