Reland of Remove slots that point to unboxed doubles from the StoreBuffer/SlotsBuffer.

Reland of Remove slots that point to unboxed doubles from the StoreBuffer/SlotsBuffer.

The problem is that tagged slot could become a double slot after migrating of an object to another map with "shifted" fields (for example as a result of generalizing immutable data property to a data field).
This CL also adds useful machinery that helps triggering incremental write barriers.

BUG=chromium:454297, chromium:465273
LOG=Y

Committed: https://crrev.com/6d0677d845c47ab9fa297de61d0e3d8e5480a02a
Cr-Commit-Position: refs/heads/master@{#27141}

[Igor Sheludko, 2015-03-09 12:48:23]

ishell@chromium.org changed reviewers:
+ hpayer@chromium.org

[Igor Sheludko, 2015-03-09 12:48:24]

PTAL

[Hannes Payer (out of office), 2015-03-09 20:00:12]

lgtm

[Igor Sheludko, 2015-03-11 18:43:09]

The CQ bit was checked by ishell@chromium.org

[commit-bot: I haz the power, 2015-03-11 18:43:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/988363002/20001

[commit-bot: I haz the power, 2015-03-11 18:45:02]

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

[commit-bot: I haz the power, 2015-03-11 18:45:03]

Try jobs failed on following builders:
  v8_mac_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel/builds/3847)

[Igor Sheludko, 2015-03-11 19:27:53]

The CQ bit was checked by ishell@chromium.org

[Igor Sheludko, 2015-03-11 19:27:53]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/988363002/#ps40001 (title:
"Rebasing")

[commit-bot: I haz the power, 2015-03-11 19:28:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/988363002/40001

[commit-bot: I haz the power, 2015-03-11 19:29:57]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-03-11 19:30:10]

Patchset 3 (id:??) landed as
https://crrev.com/6d0677d845c47ab9fa297de61d0e3d8e5480a02a
Cr-Commit-Position: refs/heads/master@{#27141}

[Igor Sheludko, 2015-03-16 09:40:09]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/1004623003/ by ishell@chromium.org.

The reason for reverting is: Increased rate of Chrome crashes. Requires further
investigation..