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To be default constructible, Archive::child_iterator needs to be able to construct an Archive::Child with a null parent, however Archive::Child's constructor always dereferenced its Parent argument to compute the remaining archive size. This commit fixes Archive::Child's constructor to only do the size calculation when the parent is non-null. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283387 91177308-0d34-0410-b5e6-96231b3b80d8