Add serializer support for out-of-line constant pool.

Add serializer support for builtins pointed by inner pointer and root objects pointed to by code for the out-of-line constant pool.

This is required for test-serialize tests which fail at the DCHECK on L1874 of serialize.cc otherwise.

R=yangguo@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23242

[rmcilroy, 2014-08-14 12:04:21]

Yang, could you please take a look, thanks.

[rmcilroy, 2014-08-15 13:04:58]

On 2014/08/14 12:04:21, rmcilroy wrote:
> Yang, could you please take a look, thanks.

I fixed the issue we discussed last night with regards to the roots getting
copied - this turned out to be due to no support for root pointers from code in
the serializer (which is required under certain circumstances for ool constant
pool).

[Yang, 2014-08-19 08:04:34]

On 2014/08/15 13:04:58, rmcilroy wrote:
> On 2014/08/14 12:04:21, rmcilroy wrote:
> > Yang, could you please take a look, thanks.
> 
> I fixed the issue we discussed last night with regards to the roots getting
> copied - this turned out to be due to no support for root pointers from code
in
> the serializer (which is required under certain circumstances for ool constant
> pool).

lgtm.

[rmcilroy, 2014-08-20 14:41:59]

Committed patchset #2 manually as 23242 (presubmit successful).