This reverts commit a6669bdc.

Reason for revert: Regresses Speedometer 2 (EmberJS-Debug-TodoMVC)

Original change's description:
> [constant-tracking] Track constants by default.
> 
> It is possible this CL results in various regressions, the idea
> is to get some data on where constant tracking helps and where
> it regresses.
> 
> Bug: v8:8361
> Change-Id: I2f291788a8bea03e6eaac9f51564c1da02734d1a
> Reviewed-on: https://chromium-review.googlesource.com/c/1347474
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58008}

TBR=jarin@chromium.org,ishell@chromium.org

Change-Id: I1e2b18c34829e1f53ea287aae0ef7fcf88980341
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8361
Reviewed-on: https://chromium-review.googlesource.com/c/1362047Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58035}