Add support for Embedded Constant Pools for PPC and Arm

Add support for Embedded Constant Pools for PPC and Arm

Embed constant pools within their corresponding Code
objects.

This removes support for out-of-line constant pools in favor
of the new approach -- the main advantage being that it
eliminates the need to allocate and manage separate constant
pool array objects.

Currently supported on PPC and ARM.  Enabled by default on
PPC only.

This yields a 6% improvment in Octane on PPC64.

R=bmeurer@chromium.org, rmcilroy@chromium.org, michael_dawson@ca.ibm.com
BUG=chromium:478811
LOG=Y

Committed: https://crrev.com/eac7f04669208cb15132d03ca15c8acd1a2be869
Cr-Commit-Position: refs/heads/master@{#28801}

[MTBrandyberry, 2015-06-04 13:54:00]

Let's try this again.

[rmcilroy, 2015-06-04 13:56:15]

On 2015/06/04 13:54:00, mtbrandyberry wrote:
> Let's try this again.

I Assume this has no real changes other than rebasing? If so, lgtm.

[MTBrandyberry, 2015-06-04 13:58:35]

On 2015/06/04 13:56:15, rmcilroy wrote:
> On 2015/06/04 13:54:00, mtbrandyberry wrote:
> > Let's try this again.
> 
> I Assume this has no real changes other than rebasing? If so, lgtm.

Yes.  Thanks.

[MTBrandyberry, 2015-06-04 13:58:44]

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

[commit-bot: I haz the power, 2015-06-04 13:58:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162993006/1

[commit-bot: I haz the power, 2015-06-04 14:44:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-04 14:44:26]

Patchset 1 (id:??) landed as
https://crrev.com/eac7f04669208cb15132d03ca15c8acd1a2be869
Cr-Commit-Position: refs/heads/master@{#28801}

[jochen (gone - plz use gerrit), 2015-06-08 12:54:28]

jochen@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-06-08 12:54:29]

https://codereview.chromium.org/1162993006/diff/1/src/objects.h
File src/objects.h (left):

https://codereview.chromium.org/1162993006/diff/1/src/objects.h#oldcode743
src/objects.h:743: CONSTANT_POOL_ARRAY_TYPE,
the constants in tools/v8heapconst.py are now incorrect, could you update them
plz?

[MTBrandyberry, 2015-06-08 14:45:59]

On 2015/06/08 12:54:29, jochen wrote:
> https://codereview.chromium.org/1162993006/diff/1/src/objects.h
> File src/objects.h (left):
> 
> https://codereview.chromium.org/1162993006/diff/1/src/objects.h#oldcode743
> src/objects.h:743: CONSTANT_POOL_ARRAY_TYPE,
> the constants in tools/v8heapconst.py are now incorrect, could you update them
> plz?

https://codereview.chromium.org/1165453009