Use address space reference counting to fix leak#171
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Previously, thread_destroy() never released address space references, causing AS structures to leak when threads were destroyed. The shared counter was incremented when threads shared an AS but never decremented. Address space is now freed when the last thread holding a reference is destroyed, rather than leaking indefinitely.
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Previously, thread_destroy() never released address space references, causing AS structures to leak when threads were destroyed. The shared counter was incremented when threads shared an AS but never decremented.
Address space is now freed when the last thread holding a reference is destroyed, rather than leaking indefinitely.