Start working on runtime support for variadic generic types #63961
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…blePack() Both return the pack immediately if its already heap allocated, by checking the least significant bit of the pack pointer. Then, - swift_allocateMetadataPack() uniques the metadata pack by the pointer equality of elements. - swift_allocateWitnessTablePack() does not unique the pack. Both return a pack pointer with the least significant bit set, indicating heap allocation.
…tead of twiddling the LSB by hand This is more type safe in theory, but in practice it's just catnip for C++ fans.
…ments for flags For now, we have a single flag, which indicates that our generic context has generic parameter packs.
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