Take runtime path if startIndex parameter requires a ToInteger() call,
which can modify the elements kind of the receiver.

This removes a stub call from the builtin, and simplifies code slightly.

BUG=v8:5986
R=bmeurer@chromium.org, cbruni@chromium.org

Change-Id: Id238a81ab8ba28621858004b34d00a4356b8037f
Reviewed-on: https://chromium-review.googlesource.com/445006Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Cr-Commit-Position: refs/heads/master@{#43323}

Unskip test which failed with Intl support disabled, and avoid using Intl
objects within the test.

BUG=chromium:634273,chromium:634357,v8:5162
NOTRY=true
R=mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2218743003
Cr-Commit-Position: refs/heads/master@{#38384}

Ensure that receiver->elements() == *dictionary after calling an accessor, in
addition to checking the prototype.

BUG=chromium:634273, chromium: 634357, v8:5162
R=cbruni@chromium.org, mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2212963002
Cr-Commit-Position: refs/heads/master@{#38347}

The contract is that the method is only invoked when there are no elements on
the prototype, and this elements type forbids accessor elements. So it is safe
to limit the search to the end of the backing store.

BUG=chromium:634269, v8:5162
R=cbruni@chromium.org, mstarzinger@chromium.org

Review-Url: https://codereview.chromium.org/2209273002
Cr-Commit-Position: refs/heads/master@{#38344}

Use LoadInstanceType() rather than LoadMapInstanceType(), as this part of the
code is operating on a JS-accessible HeapObject rather than a Map.

BUG=chromium:633883, v8:5162
R=mstarzinger@chromium.org, bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2207903002
Cr-Commit-Position: refs/heads/master@{#38297}

The feature was deprecated in M49 and flagged off in M50.
This patch removes it entirely from the codebase.

Review URL: https://codereview.chromium.org/1909433003

Cr-Commit-Position: refs/heads/master@{#35714}

This is in preparation for turning the flag off by default.

BUG=chromium:552100
LOG=n

Review URL: https://codereview.chromium.org/1511293002

Cr-Commit-Position: refs/heads/master@{#32729}

This avoids touching the Array prototype, which may have been tampered with.

BUG=chromium:443982
LOG=n

Review URL: https://codereview.chromium.org/820503005

Cr-Commit-Position: refs/heads/master@{#25908}