Builtin functions were being logged via both LogCodeObjects and
LogCompiledFunctions. The latter assumes the code in question has a
Name and so would end up logging an unattributable entry. This patch
stops logging that entry.

Bug: v8:8061
Change-Id: I20e5a853b8a214a91191fa644083bac7af9dc2c4
Reviewed-on: https://chromium-review.googlesource.com/1177759Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55302}