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In ABI v1 libc++ implements std::pointer_safety as a class type instead of an enumeration. However this class type does not provide a default constructor as it should. This patch adds that default constructor. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291059 91177308-0d34-0410-b5e6-96231b3b80d8