When comparing with zero, we can generate a CBZ instruction instead of a
CMP+B. If we teach TurboAssembler::JumpIfEqual() to do it then we can do it
in code generated for binary switches.

Change-Id: I39a045ed666fd6569bf9c9f6be28c4efbeeb01a9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1836254Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#64094}