They have been replaced with num_fuzzer.

Bug: v8:6917
Change-Id: I2f78df308cec0a58f0d665bce82503dee68fcebc
Reviewed-on: https://chromium-review.googlesource.com/888641Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michał Majewski <majeski@google.com>
Cr-Commit-Position: refs/heads/master@{#50903}