PPC: [Interpreter] Make dispatch table point to code entry instead of code objects.

PPC: [Interpreter] Make dispatch table point to code entry instead of code objects.

Port 0c05e02f25912c0ce510dac3077be3f72728aa34

Original commit message:
    Modifies Ignition to store code entry addresses in the dispatch table
    rather than code objects. This allows the interpreter to avoid
    calculating the code entry address from the code object on every
    dispatch and provides a ~5-7% performance improvement on Octane with
    Ignition.

    This change adds ArchOpcode::kArchTailCallAddress to TurboFan to enable
    tail call dispatch using these code addresses. It also adds a Dispatch
    linkage creator (distinct from the stub linkage type used previously) to
    allow targetting a code address target (which will diverge further from
    the stub linkage type when we remove the context machine register in
    Ignition).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=v8:4280
LOG=N

Committed: https://crrev.com/6c702283ac9df1cb5f577133bda722defd429a1d
Cr-Commit-Position: refs/heads/master@{#35501}

[MTBrandyberry, 2016-04-14 15:01:04]

PTAL

[MTBrandyberry, 2016-04-14 15:01:09]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-04-14 15:01:14]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1888053002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1888053002/1

[commit-bot: I haz the power, 2016-04-14 15:20:41]

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

[commit-bot: I haz the power, 2016-04-14 15:20:42]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2016-04-14 17:33:48]

On 2016/04/14 15:20:42, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm

[MTBrandyberry, 2016-04-14 17:45:37]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2016-04-14 17:45:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1888053002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1888053002/1

[commit-bot: I haz the power, 2016-04-14 17:48:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-14 17:48:23]

Description was changed from

==========
PPC: [Interpreter] Make dispatch table point to code entry instead of code
objects.

Port 0c05e02f25912c0ce510dac3077be3f72728aa34

Original commit message:
    Modifies Ignition to store code entry addresses in the dispatch table
    rather than code objects. This allows the interpreter to avoid
    calculating the code entry address from the code object on every
    dispatch and provides a ~5-7% performance improvement on Octane with
    Ignition.

    This change adds ArchOpcode::kArchTailCallAddress to TurboFan to enable
    tail call dispatch using these code addresses. It also adds a Dispatch
    linkage creator (distinct from the stub linkage type used previously) to
    allow targetting a code address target (which will diverge further from
    the stub linkage type when we remove the context machine register in
    Ignition).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=v8:4280
LOG=N
==========

to

==========
PPC: [Interpreter] Make dispatch table point to code entry instead of code
objects.

Port 0c05e02f25912c0ce510dac3077be3f72728aa34

Original commit message:
    Modifies Ignition to store code entry addresses in the dispatch table
    rather than code objects. This allows the interpreter to avoid
    calculating the code entry address from the code object on every
    dispatch and provides a ~5-7% performance improvement on Octane with
    Ignition.

    This change adds ArchOpcode::kArchTailCallAddress to TurboFan to enable
    tail call dispatch using these code addresses. It also adds a Dispatch
    linkage creator (distinct from the stub linkage type used previously) to
    allow targetting a code address target (which will diverge further from
    the stub linkage type when we remove the context machine register in
    Ignition).

R=rmcilroy@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=v8:4280
LOG=N

Committed: https://crrev.com/6c702283ac9df1cb5f577133bda722defd429a1d
Cr-Commit-Position: refs/heads/master@{#35501}
==========

[commit-bot: I haz the power, 2016-04-14 17:48:24]

Patchset 1 (id:??) landed as
https://crrev.com/6c702283ac9df1cb5f577133bda722defd429a1d
Cr-Commit-Position: refs/heads/master@{#35501}