Zygote space / partial collection support.

The zygote space is now created right before zygote fork. This space has new allocations into it disabled, this reduces memory usage since we have more shared pages.

Partial collection works by marking all the zygote space -> alloc space references by using a mod-union table and then recursively marking only over the alloc space.

Approximate improvements;

Deltablue time goes down ~0.5 seconds.

Caffeinemark score goes up ~300.

System memory usage goes down ~7MB.

Change-Id: I198389371d23deacd9b4534f39727eb641786b34

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