PPC: New page local store buffer.

PPC: New page local store buffer.

Port bb883395a814d10cee927eabe689a8070a40a86a

Original commit message:
    This replaces the global remembered set with per-page remembered sets.

    Each page in the old space, map space, and large object space keeps track of
    the set of slots in the page pointing to the new space.

    The data structure for storing slot sets is a two-level bitmap, which allows
    us to remove the store buffer overflow and SCAN_ON_SCAVENGE logic.

    Design doc: https://goo.gl/sMKCf7

R=ulan@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:578883
LOG=NO

Committed: https://crrev.com/4d85caff1bf72e02c7d6d031505958fab935837a
Cr-Commit-Position: refs/heads/master@{#33823}

[MTBrandyberry, 2016-02-08 19:38:06]

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

[commit-bot: I haz the power, 2016-02-08 19:38:16]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1679873003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1679873003/1

[ulan, 2016-02-08 19:46:29]

lgtm

[commit-bot: I haz the power, 2016-02-08 20:06:24]

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

[commit-bot: I haz the power, 2016-02-08 20:06:25]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2016-02-08 20:42:14]

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

[commit-bot: I haz the power, 2016-02-08 20:42:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1679873003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1679873003/1

[commit-bot: I haz the power, 2016-02-08 20:44:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-08 20:44:36]

Description was changed from

==========
PPC: New page local store buffer.

Port bb883395a814d10cee927eabe689a8070a40a86a

Original commit message:
    This replaces the global remembered set with per-page remembered sets.

    Each page in the old space, map space, and large object space keeps track of
    the set of slots in the page pointing to the new space.

    The data structure for storing slot sets is a two-level bitmap, which allows
    us to remove the store buffer overflow and SCAN_ON_SCAVENGE logic.

    Design doc: https://goo.gl/sMKCf7

R=ulan@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=chromium:578883
LOG=NO
==========

to

==========
PPC: New page local store buffer.

Port bb883395a814d10cee927eabe689a8070a40a86a

Original commit message:
    This replaces the global remembered set with per-page remembered sets.

    Each page in the old space, map space, and large object space keeps track of
    the set of slots in the page pointing to the new space.

    The data structure for storing slot sets is a two-level bitmap, which allows
    us to remove the store buffer overflow and SCAN_ON_SCAVENGE logic.

    Design doc: https://goo.gl/sMKCf7

R=ulan@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=chromium:578883
LOG=NO

Committed: https://crrev.com/4d85caff1bf72e02c7d6d031505958fab935837a
Cr-Commit-Position: refs/heads/master@{#33823}
==========

[commit-bot: I haz the power, 2016-02-08 20:44:37]

Patchset 1 (id:??) landed as
https://crrev.com/4d85caff1bf72e02c7d6d031505958fab935837a
Cr-Commit-Position: refs/heads/master@{#33823}