Fix remaining issues in the custom snapshot.

Fix remaining issues in the custom snapshot.

Math functions:
Some Math functions require typed arrays for their implementation. The embedded
script may call those Math functions. The serializer needs to deal with this.
Added assertion to make sure no other typed array is created when snapshotting.

Number-string cache:
We assume that the initial snapshot does not expand the number-string cache.
This is no longer true for custom heap snapshots.

Bound functions:
Bound functions store the bound arguments in a COW fixed array, including the
bindee function. COW arrays are serialized into the startup snapshot and
referenced in the partial snapshot via partial snapshot cache. However, the
bindee function is context-dependent and must not be part of the startup
snapshot. There is no need for bound functions to use a COW array though.

R=jochen@chromium.org

Committed: https://crrev.com/22e6958d63c56b332ed6e3a379e3bed25be2d1bf
Cr-Commit-Position: refs/heads/master@{#26072}

[jochen (gone - plz use gerrit), 2015-01-15 09:16:44]

what would happen if our regular snapshot all of a sudden contains typed arrays?

[Yang, 2015-01-15 09:29:24]

On 2015/01/15 09:16:44, jochen (slow) wrote:
> what would happen if our regular snapshot all of a sudden contains typed
arrays?

If they are created in JS only via typed array constructors, those would cause
the new DCHECK to fail. If they are created in some other way (e.g. via the API)
the serializer will simply and silently replace them with undefined.

[jochen (gone - plz use gerrit), 2015-01-15 09:36:08]

oh well

lgtm

[Yang, 2015-01-15 09:37:37]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-01-15 09:37:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/851073002/1

[Yang, 2015-01-15 09:55:00]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-01-15 09:55:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/851073002/20001

[commit-bot: I haz the power, 2015-01-15 10:17:16]

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

[commit-bot: I haz the power, 2015-01-15 10:17:18]

Try jobs failed on following builders:
  v8_linux_arm64_rel on tryserver.v8
(http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel/builds/2090)
  v8_linux_dbg on tryserver.v8
(http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg/builds/2137)

[Yang, 2015-01-15 10:55:21]

The CQ bit was checked by yangguo@chromium.org

[commit-bot: I haz the power, 2015-01-15 10:55:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/851073002/40001

[commit-bot: I haz the power, 2015-01-15 11:22:11]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-15 11:22:29]

Patchset 3 (id:??) landed as
https://crrev.com/22e6958d63c56b332ed6e3a379e3bed25be2d1bf
Cr-Commit-Position: refs/heads/master@{#26072}