[stubs] Unify (and optimize) implementation of ToObject.

[stubs] Unify (and optimize) implementation of ToObject.

This is the initial (big) step towards a more uniform implementation of
the ToObject abstract operation (ES6 7.1.13), where we have a fallback
implementation in JSReceiver::ToObject() and a fast (hydrogen) CodeStub
to deal with the fast case (we should be able to do more cleanup on this
in a followup CL).  For natives we expose the abstract operation via a
%_ToObject intrinsic, also exposed via a macro TO_OBJECT, that unifies
the previous confusion with TO_OBJECT_INLINE, ToObject, TO_OBJECT,
$toObject and %$toObject.  Now the whole implementation of the abstract
operation is context independent, meaning we don't need any magic in the
builtins object nor the native context.

R=mvstanton@chromium.org,yangguo@chromium.org

Committed: https://crrev.com/4fc6f5472441523c1a46d0d273ba8b216f96250f
Cr-Commit-Position: refs/heads/master@{#29953}

[Benedikt Meurer, 2015-07-31 10:53:19]

bmeurer@chromium.org changed reviewers:
+ mvstanton@chromium.org, yangguo@chromium.org

[Benedikt Meurer, 2015-07-31 10:53:19]

Hey Michael, Yang,

This is the CL I was referring to. It's basically the initial cleanup step, so
performance should be mostly neutral (we might see some improvements in
TurboFan).

Yang: Please take a look at the builtins and fullcode.
Michael: Please check the rest, esp. the code stub.

Thanks,
Benedikt

[Yang, 2015-07-31 10:58:41]

full codegen and builtins lgtm.

[mvstanton, 2015-07-31 11:04:57]

LGTM one nit. :)

https://codereview.chromium.org/1266013006/diff/1/src/ia32/interface-descript...
File src/ia32/interface-descriptors-ia32.cc (right):

https://codereview.chromium.org/1266013006/diff/1/src/ia32/interface-descript...
src/ia32/interface-descriptors-ia32.cc:109: Register registers[] = {eax};
You could also reduce the number of platform dependent lines by defining
ToObjectDescriptor::ReceiverRegister() { return eax; }

in this file, and then InitializePlatformSpecific() over in
interface-descriptors.cc.

[Benedikt Meurer, 2015-07-31 11:18:11]

Thanks for the reviews.

https://codereview.chromium.org/1266013006/diff/1/src/ia32/interface-descript...
File src/ia32/interface-descriptors-ia32.cc (right):

https://codereview.chromium.org/1266013006/diff/1/src/ia32/interface-descript...
src/ia32/interface-descriptors-ia32.cc:109: Register registers[] = {eax};
Done. Thanks for the pointer.

[Benedikt Meurer, 2015-07-31 12:11:11]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-07-31 12:11:11]

The patchset sent to the CQ was uploaded after l-g-t-m from
mvstanton@chromium.org, yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/1266013006/#ps60001
(title: "Add missing support for %_ToObject in TurboFan and Crankshaft.")

[commit-bot: I haz the power, 2015-07-31 12:11:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1266013006/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1266013006/60001

[commit-bot: I haz the power, 2015-07-31 12:25:35]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-07-31 12:25:53]

Patchset 4 (id:??) landed as
https://crrev.com/4fc6f5472441523c1a46d0d273ba8b216f96250f
Cr-Commit-Position: refs/heads/master@{#29953}