[C++11 Compat] Fix breaking change in C++11 pair copyctor.
While this code is valid C++98, it is not valid C++11. The problem can be reduced to: class MDNode; class DIType { operator MDNode*() const {return 0;} }; class WeakVH { WeakVH(MDNode*) {} }; int main() { DIType di; std::pair<void*, WeakVH> p(std::make_pair((void*)0, di))); } This was not detected by any of the bots we have because they either compile C++98 with libstdc++ (which allows it), or C++11 with libc++ (which incorrectly allows it). I ran into the problem when compiling with VS 2012 RC. Thanks to Richard for explaining the issue. llvm-svn: 158245
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