Patch against GDC's phobos to let the GC track multiple stacks per thread

[downs]

This is a patch against GDC's version of the phobos sources to allow it to track more than one stack per thread, as well as facilities to add stacks, as well as changing the std.thread class
to register itself with these new facilities.

This is required in order to allow StackThreads/coroutines to be implemented efficiently.

Comments very much appreciated.
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