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Summary: "Initialization of function-local statics is guaranteed to occur only once even when called from multiple threads, and may be more efficient than the equivalent code using std::call_once." <http://en.cppreference.com/w/cpp/thread/call_once> I'd add that it's also more readable. Reviewers: clayborg, zturner Subscribers: lldb-commits Differential Revision: http://reviews.llvm.org/D17710 llvm-svn: 284601