Refacturing BuildEmitDeepCopy.

Refacturing BuildEmitDeepCopy.

BUG=

Committed: https://code.google.com/p/v8/source/detail?r=14845

[Hannes Payer (out of office), 2013-05-27 11:28:22]

This is an effort to improve readability of BuildEmitDeepCopy while keeping the
recursive nature of this function. This will help to support multiple spaces for
allocation in BuildFastLiteral. Splitting-up BuildEmitInObjectProperties into
multipel subfunctions may not be necessary.

[mvstanton, 2013-05-28 07:29:56]

Hi Hannes, lgtm. I think your suggestion to keep BuildEmitInObjectProperties()
as one method is a good one. The decomposition creates a lot of code that looks
almost the same, including the 3-line StoreKeyed instruction, the calculation of
property offset, etc. 

If those methods could stand alone and be used by others that would be
different. But since they need to take a boilerplate object as a parameter (as
well as the highly-specific offset pointer), I think they are married to the
idea of copying boilerplate objects.

[Hannes Payer (out of office), 2013-05-28 10:44:28]

Committed patchset #2 manually as r14845 (presubmit successful).