[Interpreter] No longer require context machine register in bytecode handlers

[Interpreter] No longer require context machine register in bytecode handlers

The current context is stored as a stack slot on the interpreter frame
and therefore we don't need to also maintain a machine register for the
context. Removes this register from bytecode handlers.

In the process modifies this frees up a register on ia32 to keep the
dispatch table pointer in a register rather than on a stack slot on
ia32.

BUG=v8:4280
LOG=N

Committed: https://crrev.com/6dca3193959f912d6b87dbac5004a366dd35e3c3
Cr-Commit-Position: refs/heads/master@{#35511}

[rmcilroy, 2016-04-13 12:19:50]

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

[commit-bot: I haz the power, 2016-04-13 12:19:58]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1887493004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1887493004/1

[commit-bot: I haz the power, 2016-04-13 12:22:48]

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

[commit-bot: I haz the power, 2016-04-13 12:22:49]

Dry run: Try jobs failed on following builders:
  v8_linux_dbg_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/4194)

[rmcilroy, 2016-04-13 12:57:24]

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

[rmcilroy, 2016-04-13 12:57:24]

Benedikt, PTAL.

This is a follow on from https://codereview.chromium.org/1882073002/.

[rmcilroy, 2016-04-13 12:58:51]

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

[commit-bot: I haz the power, 2016-04-13 12:59:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1887493004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1887493004/20001

[commit-bot: I haz the power, 2016-04-13 13:51:23]

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

[commit-bot: I haz the power, 2016-04-13 13:51:24]

Dry run: This issue passed the CQ dry run.

[Benedikt Meurer, 2016-04-14 18:42:27]

Sorry this somehow slipped thru the cracks, feel free to just send me the review
link in case I don't reply within a day.

As for the CL: Very nice! LGTM.

[rmcilroy, 2016-04-15 09:09:15]

On 2016/04/14 18:42:27, Benedikt Meurer wrote:
> Sorry this somehow slipped thru the cracks, feel free to just send me the
review
> link in case I don't reply within a day.

No worries, I was waiting for the previous CLs to get some perf numbers first
anyway. 

> As for the CL: Very nice! LGTM.

Thanks.

[rmcilroy, 2016-04-15 09:09:41]

The CQ bit was checked by rmcilroy@chromium.org

[commit-bot: I haz the power, 2016-04-15 09:09:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1887493004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1887493004/20001

[commit-bot: I haz the power, 2016-04-15 09:33:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-04-15 09:34:48]

Description was changed from

==========
[Interpreter] No longer require context machine register in bytecode handlers

The current context is stored as a stack slot on the interpreter frame
and therefore we don't need to also maintain a machine register for the
context. Removes this register from bytecode handlers.

In the process modifies this frees up a register on ia32 to keep the
dispatch table pointer in a register rather than on a stack slot on
ia32.

BUG=v8:4280
LOG=N
==========

to

==========
[Interpreter] No longer require context machine register in bytecode handlers

The current context is stored as a stack slot on the interpreter frame
and therefore we don't need to also maintain a machine register for the
context. Removes this register from bytecode handlers.

In the process modifies this frees up a register on ia32 to keep the
dispatch table pointer in a register rather than on a stack slot on
ia32.

BUG=v8:4280
LOG=N

Committed: https://crrev.com/6dca3193959f912d6b87dbac5004a366dd35e3c3
Cr-Commit-Position: refs/heads/master@{#35511}
==========

[commit-bot: I haz the power, 2016-04-15 09:34:49]

Patchset 2 (id:??) landed as
https://crrev.com/6dca3193959f912d6b87dbac5004a366dd35e3c3
Cr-Commit-Position: refs/heads/master@{#35511}