Revert of [heap] Divide available memory upon compaction tasks

Revert of [heap] Divide available memory upon compaction tasks (patchset #9 id:340001 of https://codereview.chromium.org/1382003002/ )

Reason for revert:
Failing tests: https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20nosnap%20-%20debug%20-%202/builds/3804/steps/Check/logs/DontLeakGlobalObjects

Original issue's description:
> [heap] Divide available memory upon compaction tasks
>
> - Fairly (round-robin) divide available memory upon compaction tasks.
> - Ensure an upper limit (of memory) since dividing is O(n) for n free-space
>   nodes.
> - Refill from free lists managed by sweeper once a compaction space becomes
>   empty.
>
> Assumption for dividing memory: Memory in the free lists is sparse upon starting
> compaction (which means that only few nodes are available), except for memory
> reducer GCs, which happen in idle time though (so it's less of a problem).
>
> BUG=chromium:524425
> LOG=N
>
> Committed: https://crrev.com/30236c052ba9266fc55412a8fd63b17f683ff40b
> Cr-Commit-Position: refs/heads/master@{#31234}

TBR=ulan@chromium.org,hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:524425
Committed: https://crrev.com/ec1046f9f8cd52488917b439c598296620103d39
Cr-Commit-Position: refs/heads/master@{#31235}

[Michael Lippautz, 2015-10-13 11:59:46]

Created Revert of [heap] Divide available memory upon compaction tasks

[commit-bot: I haz the power, 2015-10-13 11:59:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406533002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406533002/1

[commit-bot: I haz the power, 2015-10-13 12:00:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-13 12:00:17]

Patchset 1 (id:??) landed as
https://crrev.com/ec1046f9f8cd52488917b439c598296620103d39
Cr-Commit-Position: refs/heads/master@{#31235}