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In particular, make TinyPtrVector<PtrIntPair<T *, 1>> work. Remove all unnecessary assumptions that the element type has a formal "null" representation. The important property to maintain is that default-constructed element type has the same internal representation as the default-constructed PointerUnion (all zero bits). Remove the incorrect recursive behavior from PointerUnion::isNull. This was never generally correct because it only recursed over the first type parameter. With variadic templates it's completely unnecessary. llvm-svn: 369473
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