Also TNodify TypeOf in code-stub-assembler.

BUG=v8:6949, v8:9396

Change-Id: I12a66a077fe82df44ce3c46a87f1fda754be9423
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1803334Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63757}