Just clear semi-space mark bits once before Scavenge

Just clear semi-space mark bits once before Scavenge

Both PrepareForScavenge and ResetAllocationInfo clear semi-space mark bits before Scavenge. Doing this once is good enough.

BUG=

Committed: https://crrev.com/0962f980a21629bbe5a58bb9817fb0f99662bac8
Cr-Commit-Position: refs/heads/master@{#28778}

[sejunho, 2015-05-29 00:58:14]

sejunho@gmail.com changed reviewers:
+ hpayer@chromium.org

[sejunho, 2015-05-29 00:58:14]

Hi Hannes,
I fix description this patch, the change is same before:
https://codereview.chromium.org/1152523004/

[sejunho, 2015-06-03 00:24:25]

PTAL

[Hannes Payer (out of office), 2015-06-03 06:25:20]

LGTM, thanks. I updated the description

[Hannes Payer (out of office), 2015-06-03 06:25:27]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2015-06-03 06:25:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1158623003/1

[commit-bot: I haz the power, 2015-06-03 07:09:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-03 07:09:44]

Patchset 1 (id:??) landed as
https://crrev.com/0962f980a21629bbe5a58bb9817fb0f99662bac8
Cr-Commit-Position: refs/heads/master@{#28778}

[sejunho, 2015-06-03 07:29:26]

On 2015/06/03 06:25:20, Hannes Payer wrote:
> LGTM, thanks. I updated the description

Thanks!!!! :)