For example, when --fuzzing is off, %OptimizeFunctionOnNextCall now
crashes when given a non-function argument.

The following behaviors remain unchanged for now:
- %DeoptimizeFunction continues to do nothing if the function is not
  optimized.
- %DeoptimizeNow continues to do nothing if the top-most JS function
  is not optimized.
- %OptimizeOSR continues to do nothing if the function already has
  optimized code.

Bug: v8:10249
Change-Id: I35d2f3d50ce3f94c8ffccabe50fb4df2b70ce028
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2137406
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67121}