[csa] Tnodify builtins-date-gen.cc

Bug: v8:6949

Change-Id: I119d270cddf931125be6884f671e2f0499ff4118
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1849517Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64212}