On desktop systems, we use a very basic tiering strategy: Everything is
initially compiled with Liftoff, and once that is done, the module can
start being used. Concurrently to the execution, we re-compile all code
with TurboFan, and hot-swap each function once TurboFan finishes.

We should start using a more dynamic strategy where each function is
tiered-up when judged necessary. This change will then tier-up each
liftoff function once it has been called 5 times.

I then added a counter in the native module, that is updated directly
from Liftoff code, and a runtime call is then made when the counter
reaches the goal.

R=clemensb@chromium.org
CC=​thibaudm@chromium.org

Bug: v8:10728
Change-Id: I8dc2b02fdff8d97781bb1cf496886594b3d7f644
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2306803
Commit-Queue: Arnaud Robin <arobin@google.com>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68971}