This patch wraps callsites to %AddElement to fall back to adding a
named property in case it is given an argument of 2**32 or greater.
The change is needed because %AddElement is called by Array functions
in various places, and ES2015 changes these Array functions to use
ToLength rather than ToUint32, so several callsites of %AddElement
which used to be reliable array indices may be larger numbers. While
the proper long-term solution may be to call out to
Object.defineProperty, this fix should allow the ToLength semantics
to be shipped while preserving correctness and not requiring a
rewrite.

BUG=v8:4516
LOG=Y
R=adamk
TEST=Interactively ran Array.prototype.slice on an Array-like which
exceeded array bounds, and found that this did not check-fail at
runtime as it did before.
Microbenchmarked this technique against the previous version on a
simple reverse implementation and found at most a 1% slowdown, as
opposed to other techniques, like calling %DefineDataPropertyUnchecked,
which had a 20% slowdown or Object.defineProperty with a 80% slowdown.

Review URL: https://codereview.chromium.org/1420663003

Cr-Commit-Position: refs/heads/master@{#31640}