Keep track of ArrayBuffers based on collector type, not space

Keep track of ArrayBuffers based on collector type, not space

Since Mark/Compact also collects garbage in the new space, we can't just
free old space ArrayBuffers during MC - otherwise we run the risk of
never freeing new array buffers

BUG=v8:4201
R=hpayer@chromium.org
LOG=n

Committed: https://crrev.com/839170e78536f2867ab6e42872dfa87bef0e5959
Cr-Commit-Position: refs/heads/master@{#29190}

[jochen (gone - plz use gerrit), 2015-06-22 09:47:03]

ptal

[Hannes Payer (out of office), 2015-06-22 12:54:23]

lgtm

https://codereview.chromium.org/1199913002/diff/20001/src/heap/heap.h
File src/heap/heap.h (right):

https://codereview.chromium.org/1199913002/diff/20001/src/heap/heap.h#newcode...
src/heap/heap.h:2374: 
Can we add comments to describe what these data structures are holding?

[jochen (gone - plz use gerrit), 2015-06-22 13:01:11]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-06-22 13:01:11]

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/1199913002/#ps40001
(title: "comments")

[commit-bot: I haz the power, 2015-06-22 13:01:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1199913002/40001

[commit-bot: I haz the power, 2015-06-22 13:24:44]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-06-22 13:24:58]

Patchset 3 (id:??) landed as
https://crrev.com/839170e78536f2867ab6e42872dfa87bef0e5959
Cr-Commit-Position: refs/heads/master@{#29190}