[Local GC] Enable feature: WRITE_BARRIER_CHECK

[swgillespie]

This feature introduces three global variables shared between write barrier code and the GC. If we wish to support this feature, we will need to split these globals into separate EE and GC that are synchronized whenever one side changes them.

[swgillespie]

Triage:

I'm not really sure what WRITE_BARRIER_CHECK even does and it does not appear that it's used very often. If a runtime dev wants to use it, they don't have to use a standalone GC.

That said, enabling this feature will require a breaking change to the EE/GC interface.

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