PPC: [heap] Move to page lookups for SemiSpace, NewSpace, and Heap containment methods

PPC: [heap] Move to page lookups for SemiSpace, NewSpace, and Heap containment methods

Port cfbd25617cfb8177bbb6377280e23ec356eb2373

Original commit message:

    Preparing the young generation for (real) non-contiguous backing memory, this
    change removes object masks that are used to compute containment in semi and new
    space. The masks are replaced by lookups for object tags and page headers, where
    possible.

    Details:
    - Use the fast checks (page header lookups) for containment in regular code.
    - Use the slow version that masks out the page start adress and iterates all
      pages of a space for debugging/verification.
    - The slow version works for off-heap/unmapped memory.
    - Encapsulate all checks for the old->new barrier in Heap::RecordWrite().

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:581412
LOG=N

Committed: https://crrev.com/1ab7f2f8408c18509f31638675d7a9bc153c38df
Cr-Commit-Position: refs/heads/master@{#33877}

[MTBrandyberry, 2016-02-10 18:56:45]

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

[commit-bot: I haz the power, 2016-02-10 18:56:50]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1687113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1687113002/1

[michael_dawson, 2016-02-10 19:05:32]

On 2016/02/10 18:56:50, commit-bot: I haz the power wrote:
> Dry run: CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1687113002/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1687113002/1

lgtm

[commit-bot: I haz the power, 2016-02-10 19:20:53]

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

[commit-bot: I haz the power, 2016-02-10 19:20:53]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2016-02-10 20:07:09]

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

[commit-bot: I haz the power, 2016-02-10 20:07:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1687113002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1687113002/1

[commit-bot: I haz the power, 2016-02-10 20:09:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-11 10:40:58]

Description was changed from

==========
PPC: [heap] Move to page lookups for SemiSpace, NewSpace, and Heap containment
methods

Port cfbd25617cfb8177bbb6377280e23ec356eb2373

Original commit message:

    Preparing the young generation for (real) non-contiguous backing memory,
this
    change removes object masks that are used to compute containment in semi and
new
    space. The masks are replaced by lookups for object tags and page headers,
where
    possible.

    Details:
    - Use the fast checks (page header lookups) for containment in regular code.
    - Use the slow version that masks out the page start adress and iterates all
      pages of a space for debugging/verification.
    - The slow version works for off-heap/unmapped memory.
    - Encapsulate all checks for the old->new barrier in Heap::RecordWrite().

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=chromium:581412
LOG=N
==========

to

==========
PPC: [heap] Move to page lookups for SemiSpace, NewSpace, and Heap containment
methods

Port cfbd25617cfb8177bbb6377280e23ec356eb2373

Original commit message:

    Preparing the young generation for (real) non-contiguous backing memory,
this
    change removes object masks that are used to compute containment in semi and
new
    space. The masks are replaced by lookups for object tags and page headers,
where
    possible.

    Details:
    - Use the fast checks (page header lookups) for containment in regular code.
    - Use the slow version that masks out the page start adress and iterates all
      pages of a space for debugging/verification.
    - The slow version works for off-heap/unmapped memory.
    - Encapsulate all checks for the old->new barrier in Heap::RecordWrite().

R=mlippautz@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=chromium:581412
LOG=N

Committed: https://crrev.com/1ab7f2f8408c18509f31638675d7a9bc153c38df
Cr-Commit-Position: refs/heads/master@{#33877}
==========

[commit-bot: I haz the power, 2016-02-11 10:40:59]

Patchset 1 (id:??) landed as
https://crrev.com/1ab7f2f8408c18509f31638675d7a9bc153c38df
Cr-Commit-Position: refs/heads/master@{#33877}