This reverts commit 384a51da.

This hack is both broken (builtins now have individual symbols and no
longer resolve to v8_Default_embedded_blob_) and useless (profview
seems to detect builtins just fine without it).

Bug: v8:6666
Change-Id: I264b4de31124f1657f4dc570590eb73e53aa08d2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1627344Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61842}