The macro may be defined but the value to it may not be assigned. The
compiler can complain about (reproduced when compiling chromium on
Windows).

Bug: chromium:1249550
Change-Id: I684997ccda7122f56c01391e7a1339fadf6589e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3297888Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78040}