Add {Map,Set}::FromArray to the API

Add {Map,Set}::FromArray to the API

These are similar to the Map/Set constructors when called with an array,
except that they are guaranteed to be side-effect free if called with
a packed array.

This will be useful in implementing structured clone which, as
specified in HTML, speaks in terms of the internal [[MapData]]
and [[SetData]] slots without going through the exposed iteration
ES semantics.

BUG=v8:3340
LOG=y

Committed: https://crrev.com/cb07b8ef1a5d868a66d847c8d78af58947d21425
Cr-Commit-Position: refs/heads/master@{#28642}

[jochen (gone - plz use gerrit), 2015-05-26 15:43:00]

jochen@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-05-26 15:43:01]

lgtm

[arv (Not doing code reviews), 2015-05-26 16:37:39]

arv@chromium.org changed reviewers:
+ arv@chromium.org

[arv (Not doing code reviews), 2015-05-26 16:37:40]

LGTM

https://codereview.chromium.org/1155893003/diff/1/include/v8.h
File include/v8.h (right):

https://codereview.chromium.org/1155893003/diff/1/include/v8.h#newcode2986
include/v8.h:2986: * Guaranteed to be side-effect free if the array contains no
holes.
If the main use case is structured clone we could do an array where the keys and
values are interleaved.

[k0, v0, k1, v1, ... kn, vn]

https://codereview.chromium.org/1155893003/diff/1/src/collection.js
File src/collection.js (right):

https://codereview.chromium.org/1155893003/diff/1/src/collection.js#newcode451
src/collection.js:451: }
;

https://codereview.chromium.org/1155893003/diff/1/src/collection.js#newcode460
src/collection.js:460: }
;

[adamk, 2015-05-26 17:27:45]

https://codereview.chromium.org/1155893003/diff/1/include/v8.h
File include/v8.h (right):

https://codereview.chromium.org/1155893003/diff/1/include/v8.h#newcode2986
include/v8.h:2986: * Guaranteed to be side-effect free if the array contains no
holes.
On 2015/05/26 16:37:40, arv wrote:
> If the main use case is structured clone we could do an array where the keys
and
> values are interleaved.
> 
> [k0, v0, k1, v1, ... kn, vn]

Let's leave this for a later round where we optimize the performance. For now
I'd rather leave this symmetric with AsArray().

https://codereview.chromium.org/1155893003/diff/1/src/collection.js
File src/collection.js (right):

https://codereview.chromium.org/1155893003/diff/1/src/collection.js#newcode451
src/collection.js:451: }
On 2015/05/26 16:37:40, arv wrote:
> ;

Done.

https://codereview.chromium.org/1155893003/diff/1/src/collection.js#newcode460
src/collection.js:460: }
On 2015/05/26 16:37:40, arv wrote:
> ;

Done.

[adamk, 2015-05-26 18:17:53]

The CQ bit was checked by adamk@chromium.org

[adamk, 2015-05-26 18:17:54]

The patchset sent to the CQ was uploaded after l-g-t-m from arv@chromium.org,
jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1155893003/#ps40001
(title: "Rebased")

[commit-bot: I haz the power, 2015-05-26 18:18:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1155893003/40001

[commit-bot: I haz the power, 2015-05-26 18:50:21]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-26 18:50:34]

Patchset 3 (id:??) landed as
https://crrev.com/cb07b8ef1a5d868a66d847c8d78af58947d21425
Cr-Commit-Position: refs/heads/master@{#28642}