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This CL adds a counter for sorting non-packed JSArrays where
Object.prototype was modified, or the prototype of the instance
differs from Array.prototype.

This is the Chromium side of the change.
The V8-side CL: https://crrev.com/c/1051650

R=jgruber@chromium.org

Bug: v8:7382
Change-Id: I46f0963b8b79380fe5c5defa50dba517df77b72c
Reviewed-on: https://chromium-review.googlesource.com/1051651Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Simon Zünd <szuend@google.com>
Cr-Commit-Position: refs/heads/master@{#558263}