[turbofan] Introduce initial support for TypedArrays.

[turbofan] Introduce initial support for TypedArrays.

This adds support for lowering keyed access to JSTypedArray objects to
element loads and stores instead of IC calls. There's still a lot of
room for improvement, but the improvements can be done incrementally
later.

We add a dedicated UnsafePointerAdd operator, which sits in the effect
chain, and does the (GC invisible) computation of addresses that are
potentially inside HeapObjects. Also there's now a dedicated Retain
operator, which ensures that we retain a certain tagged value, which is
necessary to ensure that we keep a JSArrayBuffer alive as long as we
might still potentially access elements in its backing store.

R=epertoso@chromium.org

Committed: https://crrev.com/66f2d3bd66505f45b68f056164abfde0a9b331f5
Cr-Commit-Position: refs/heads/master@{#38235}

[Benedikt Meurer, 2016-08-02 07:24:43]

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

[commit-bot: I haz the power, 2016-08-02 07:24:46]

Dry run: 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, 2016-08-02 07:42:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-02 07:42:52]

Dry run: Try jobs failed on following builders:
  v8_linux_dbg_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/10086)
  v8_linux_dbg_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng_triggered/b...)

[Benedikt Meurer, 2016-08-02 08:28:19]

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

[commit-bot: I haz the power, 2016-08-02 08:28:28]

Dry run: 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, 2016-08-02 08:56:11]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-02 08:56:11]

Dry run: This issue passed the CQ dry run.

[epertoso, 2016-08-02 09:13:05]

lgtm

[epertoso, 2016-08-02 09:13:06]

lgtm

[Benedikt Meurer, 2016-08-02 09:37:32]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-08-02 09:37:36]

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, 2016-08-02 09:39:20]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-08-02 09:41:08]

Description was changed from

==========
[turbofan] Introduce initial support for TypedArrays.

This adds support for lowering keyed access to JSTypedArray objects to
element loads and stores instead of IC calls. There's still a lot of
room for improvement, but the improvements can be done incrementally
later.

We add a dedicated UnsafePointerAdd operator, which sits in the effect
chain, and does the (GC invisible) computation of addresses that are
potentially inside HeapObjects. Also there's now a dedicated Retain
operator, which ensures that we retain a certain tagged value, which is
necessary to ensure that we keep a JSArrayBuffer alive as long as we
might still potentially access elements in its backing store.

R=epertoso@chromium.org
==========

to

==========
[turbofan] Introduce initial support for TypedArrays.

This adds support for lowering keyed access to JSTypedArray objects to
element loads and stores instead of IC calls. There's still a lot of
room for improvement, but the improvements can be done incrementally
later.

We add a dedicated UnsafePointerAdd operator, which sits in the effect
chain, and does the (GC invisible) computation of addresses that are
potentially inside HeapObjects. Also there's now a dedicated Retain
operator, which ensures that we retain a certain tagged value, which is
necessary to ensure that we keep a JSArrayBuffer alive as long as we
might still potentially access elements in its backing store.

R=epertoso@chromium.org

Committed: https://crrev.com/66f2d3bd66505f45b68f056164abfde0a9b331f5
Cr-Commit-Position: refs/heads/master@{#38235}
==========

[commit-bot: I haz the power, 2016-08-02 09:41:09]

Patchset 2 (id:??) landed as
https://crrev.com/66f2d3bd66505f45b68f056164abfde0a9b331f5
Cr-Commit-Position: refs/heads/master@{#38235}