Correctly accept already preprocessed stack traces.

Correctly accept already preprocessed stack traces.

When we preprocess stack traces, we turn code pointer and offset to
source position, and store it in place of code pointer as smi.

Preprocessing stack traces is currently disabled due to issue 4065.

R=jkummerow@chromium.org

Committed: https://crrev.com/7f927ced51bf5b5eda746d8c92ff645ccc33231c
Cr-Commit-Position: refs/heads/master@{#28213}

[Jakob Kummerow, 2015-05-04 14:46:36]

LGTM

[Yang, 2015-05-04 14:54:31]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-05-04 14:54:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125723002/1

[commit-bot: I haz the power, 2015-05-04 14:58:08]

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

[commit-bot: I haz the power, 2015-05-04 14:58:09]

Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/80)

[Yang, 2015-05-05 06:59:26]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-05-05 06:59:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125723002/1

[Yang, 2015-05-05 07:01:18]

The CQ bit was checked by yangguo@chromium.org

[Yang, 2015-05-05 07:01:19]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1125723002/#ps20001
(title: "fix")

[commit-bot: I haz the power, 2015-05-05 07:01:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1125723002/20001

[commit-bot: I haz the power, 2015-05-05 07:29:00]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-05 07:29:11]

Patchset 2 (id:??) landed as
https://crrev.com/7f927ced51bf5b5eda746d8c92ff645ccc33231c
Cr-Commit-Position: refs/heads/master@{#28213}