Revert part of "Disallow Archive::child_iterator that don't point to an archive."

This reverts parts of commit r241747. MSVC doesn't like it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241753 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed