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There were a number of cases where __double_underscore functions, for example __has_construct_test, were called without being qualified, causing ADL to occur. This patch qualifies those calls to avoid this problem. Thanks to David L. Jones for point out the issue initially. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@313324 91177308-0d34-0410-b5e6-96231b3b80d8