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Previously we implemented all one trillion tuple-like constructors using a single generic overload. This worked fairly well, except that it differed in behavior from the standard version because it didn't consider both T&& and T const&. This was observable for certain types. This patch addresses that issue by splitting the generic constructor in two. We now provide both T&& and T const& versions of the tuple-like constructors (sort of). git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@365973 91177308-0d34-0410-b5e6-96231b3b80d8