[heap] Refactor and clean up FreeListCategory.

[heap] Refactor and clean up FreeListCategory.

BUG=

Committed: https://crrev.com/1d998bd0a6297a282739ff976bba7ebeb149fea6
Cr-Commit-Position: refs/heads/master@{#31048}

[Michael Lippautz, 2015-10-01 12:06:58]

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

[Michael Lippautz, 2015-10-01 12:06:59]

https://codereview.chromium.org/1377723003/diff/1/src/heap/spaces.h
File src/heap/spaces.h (right):

https://codereview.chromium.org/1377723003/diff/1/src/heap/spaces.h#newcode755
src/heap/spaces.h:755: enum FreeListCategoryType { kSmall, kMedium, kLarge,
kHuge };
This one will come in handy for programmatically selecting a free list in
follow-up CLs.

[Michael Lippautz, 2015-10-01 12:25:09]

The CQ bit was checked by mlippautz@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-01 12:25:21]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377723003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377723003/1

[commit-bot: I haz the power, 2015-10-01 13:12:49]

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

[commit-bot: I haz the power, 2015-10-01 13:12:50]

Dry run: This issue passed the CQ dry run.

[Hannes Payer (out of office), 2015-10-01 13:13:25]

On 2015/10/01 13:12:50, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

Lgtm

[Michael Lippautz, 2015-10-01 13:15:20]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2015-10-01 13:15:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377723003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377723003/1

[commit-bot: I haz the power, 2015-10-01 13:17:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-01 13:17:24]

Patchset 1 (id:??) landed as
https://crrev.com/1d998bd0a6297a282739ff976bba7ebeb149fea6
Cr-Commit-Position: refs/heads/master@{#31048}