[turbofan] Properly use MachineRepresentation for field access.

[turbofan] Properly use MachineRepresentation for field access.

When lowering DataField accesses, we should pay attention to the
MachineRepresentation reported by the AccessInfo. This doesn't
yet change the rest of the pipeline to take full advantage of
the representations.

Drive-by-fix: Make the code more robust, especially the part that
deals with mutable heap number access.

R=mvstanton@chromium.org
BUG=v8:5267, v8:5270
Committed: https://crrev.com/0fb92f273526f105adabd63dda92ebc44192dc27
Cr-Commit-Position: refs/heads/master@{#39381}

[Benedikt Meurer, 2016-09-13 12:01:35]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-13 12:01:45]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Benedikt Meurer, 2016-09-13 12:02:29]

Hey Michael,

Some cleanup on the representation vs. type mess I created previously in
JSNativeContextSpecialization. Next step would be to take advantage of that in
later phases.
Please take a look.

Thanks,
Benedikt

[mvstanton, 2016-09-13 12:06:45]

Okay, great. lgtm.

[Benedikt Meurer, 2016-09-13 12:16:47]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2016-09-13 12:16:54]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-09-13 12:17:06]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-13 12:24:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-13 12:25:06]

Description was changed from

==========
[turbofan] Properly use MachineRepresentation for field access.

When lowering DataField accesses, we should pay attention to the
MachineRepresentation reported by the AccessInfo. This doesn't
yet change the rest of the pipeline to take full advantage of
the representations.

Drive-by-fix: Make the code more robust, especially the part that
deals with mutable heap number access.

R=mvstanton@chromium.org
BUG=v8:5267,v8:5270
==========

to

==========
[turbofan] Properly use MachineRepresentation for field access.

When lowering DataField accesses, we should pay attention to the
MachineRepresentation reported by the AccessInfo. This doesn't
yet change the rest of the pipeline to take full advantage of
the representations.

Drive-by-fix: Make the code more robust, especially the part that
deals with mutable heap number access.

R=mvstanton@chromium.org
BUG=v8:5267,v8:5270

Committed: https://crrev.com/0fb92f273526f105adabd63dda92ebc44192dc27
Cr-Commit-Position: refs/heads/master@{#39381}
==========

[commit-bot: I haz the power, 2016-09-13 12:25:11]

Patchset 1 (id:??) landed as
https://crrev.com/0fb92f273526f105adabd63dda92ebc44192dc27
Cr-Commit-Position: refs/heads/master@{#39381}

[mvstanton, 2016-09-13 12:25:29]

lgtm, thanks for spreading the new representations :). I'm getting my CL from
last week ready...