SFI::DisableOptimization can only be called on certain function kinds.
Update %NeverOptimizeFunction to crash/do nothing if these conditions
are not fulfilled in normal/fuzzing configurations.

Bug: chromium:1074689
Change-Id: I371dd539e27447ede48c69d0480a3d224071b304
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2169926Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67429}