This removes the Javascript version of Array.from in js/array.js and
adds a CodeStubAssembler version in src/builtins/builtins-array-gen.cc.

Also modify IteratorBuiltinsAssembler to allow querying the existence
of the iterator method without calling it so we can fall back to the
array-like behavior.

BUG=v8:1956

Change-Id: Ibfb3cef002d72d70bd30b4de676fd22becde006c
Reviewed-on: https://chromium-review.googlesource.com/887066Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51208}