[Interpreter] Maintain a pointer to the current position in the bytecode

[Interpreter] Maintain a pointer to the current position in the bytecode

Maintain a pointer to the current position in the bytecode where 
possible to avoid having to recompute this position based on the
bytecode offset and bytecode array pointer on every access to the 
bytecode.

BUG=v8:4280

[rmcilroy, 2016-06-23 16:44:28]

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

[commit-bot: I haz the power, 2016-06-23 16:44:36]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2092763002/40001

[rmcilroy, 2016-06-23 16:44:38]

Patchset #2 (id:20001) has been deleted

[rmcilroy, 2016-06-23 16:44:42]

Patchset #1 (id:1) has been deleted

[rmcilroy, 2016-06-23 16:45:58]

Description was changed from

==========
NOT FOR REVIEW, Bytecode Inner Pointer

BUG=
==========

to

==========
[Interpreter] Maintain a pointer to the current position in the bytecode

Maintain a pointer to the current position in the bytecode where 
possible to avoid having to recompute this position based on the
bytecode offset and bytecode array pointer on every access to the 
bytecode.

BUG=v8:4280
==========

[commit-bot: I haz the power, 2016-06-23 17:02:14]

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

[commit-bot: I haz the power, 2016-06-23 17:02:15]

Dry run: Try jobs failed on following builders:
  v8_linux_nodcheck_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_nodcheck_rel_ng/bu...)
  v8_linux_nodcheck_rel_ng_triggered on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_nodcheck_rel_ng_tr...)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/3729)
  v8_mac_rel_ng_triggered on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng_triggered/bui...)

[rmcilroy, 2016-06-23 19:26:56]

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

[commit-bot: I haz the power, 2016-06-23 19:27:04]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2092763002/60001

[rmcilroy, 2016-06-23 19:29:04]

rmcilroy@chromium.org changed reviewers:
+ oth@chromium.org

[rmcilroy, 2016-06-23 19:29:05]

This also seems to give a couple of points on x64 and arm32. I'll land
separately from the other one so we can track performance on the bots. PTAL,
thanks.

[commit-bot: I haz the power, 2016-06-23 19:53:37]

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

[commit-bot: I haz the power, 2016-06-23 19:53:38]

Dry run: This issue passed the CQ dry run.

[oth, 2016-06-24 09:32:50]

lgtm, thanks.

[rmcilroy, 2016-06-24 11:07:54]

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

[commit-bot: I haz the power, 2016-06-24 11:08:00]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2092763002/80001

[commit-bot: I haz the power, 2016-06-24 11:34:29]

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

[commit-bot: I haz the power, 2016-06-24 11:34:30]

Dry run: This issue passed the CQ dry run.

[rmcilroy, 2016-06-24 12:54:46]

This actually seems to be mostly a regression on the bots now that the other CL
has landed. I'll park this for now and maybe look into it further later.

[rmcilroy, 2016-06-24 12:54:46]

This actually seems to be mostly a regression on the bots now that the other CL
has landed. I'll park this for now and maybe look into it further later.