[turbofan] Port Crankshaft's weak objects mechanism to TurboFan.

[turbofan] Port Crankshaft's weak objects mechanism to TurboFan.

Use the same mechanism that is already available for Crankshaft to not
leak all kinds of things in TurboFan generated code. Long-term we will
support weakness in a better way, but for now, just use the
infrastructure that is already in place to avoid memory leaks via
TurboFan generated code.

R=jarin@chromium.org, ulan@chromium.org

Committed: https://crrev.com/84a88a1bd0e5c1dcdf30d4eeda20628fb3e0bd4b
Cr-Commit-Position: refs/heads/master@{#33073}

[Benedikt Meurer, 2015-12-31 12:28:34]

Hey Ulan, Jaro,

As discussed two weeks ago, let's first apply what we already have to make sure
TurboFan doesn't regress too much in practice ATM, and buy us some time to think
about a real solution for TurboFan.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-01-04 06:49:27]

lgtm

[Benedikt Meurer, 2016-01-04 06:50:08]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-01-04 06:50:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1555743003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1555743003/1

[commit-bot: I haz the power, 2016-01-04 07:11:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-04 07:12:40]

Description was changed from

==========
[turbofan] Port Crankshaft's weak objects mechanism to TurboFan.

Use the same mechanism that is already available for Crankshaft to not
leak all kinds of things in TurboFan generated code. Long-term we will
support weakness in a better way, but for now, just use the
infrastructure that is already in place to avoid memory leaks via
TurboFan generated code.

R=jarin@chromium.org, ulan@chromium.org
==========

to

==========
[turbofan] Port Crankshaft's weak objects mechanism to TurboFan.

Use the same mechanism that is already available for Crankshaft to not
leak all kinds of things in TurboFan generated code. Long-term we will
support weakness in a better way, but for now, just use the
infrastructure that is already in place to avoid memory leaks via
TurboFan generated code.

R=jarin@chromium.org, ulan@chromium.org

Committed: https://crrev.com/84a88a1bd0e5c1dcdf30d4eeda20628fb3e0bd4b
Cr-Commit-Position: refs/heads/master@{#33073}
==========

[commit-bot: I haz the power, 2016-01-04 07:12:41]

Patchset 1 (id:??) landed as
https://crrev.com/84a88a1bd0e5c1dcdf30d4eeda20628fb3e0bd4b
Cr-Commit-Position: refs/heads/master@{#33073}