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Currently there are a number of global fields in JSRuntime* which are basically tracking per-thread state. This makes sense on the current trunk since there is only ever a single thread associated with a runtime, but as Parallel JS (nee Rivertrail) starts to land this assumption no longer holds. This patch makes a struct, currently called |JS::PerThreadData|, that stores per-thread data from the runtime. There is one instance of this struct embedded in "Runtime" itself (the field |mainThread|). For now I have only migrated the debug GC fields into |PerThread|, those are the ones causing me immediate pain. Eventually more fields will want to move into there. The eventual goal is to distinguish thread-safe code, which will take as argument a |JS::PerThread*|, from non-thread-safe code, which will take a |JSRuntime*| or |JSContext*|. |
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