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Rather than allocating Decl objects with an Allocator, we instead allocate them with a SegmentedList. This provides four advantages: * Stable memory so that one thread can access a Decl object while another thread allocates additional Decl objects from this list. * It allows us to use u32 indexes to reference Decl objects rather than pointers, saving memory in Type, Value, and dependency sets. * Using integers to reference Decl objects rather than pointers makes serialization trivial. * It provides a unique integer to be used for anonymous symbol names, avoiding multi-threaded contention on an atomic counter.