This CL changes the generic version of Array#sort to use 'strict'
DeleteProperty when "moving" holes to the end of the sort range.

This brings V8 not only in line with the proposed Array#sort spec
change, but also closer to what other engines do. Now all engines
throw a TypeError when the new test case is run.

R=jgruber@chromium.org, mathias@chromium.org

Bug: v8:8714
Change-Id: Ic5bcd152ad55fd534c1e9e3218393bfe4a50667e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1666995
Commit-Queue: Simon Zünd <szuend@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Auto-Submit: Simon Zünd <szuend@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62273}