Currently, with -fsanitize=address, the driver appends libclang_rt.asan.a to
the link command. This all works fine when the driver is also responsible for adding -lstdc++ to the link command. But, if -lstdc++ (or libstdc++.a, etc) is passed explicitly to the driver, the ASan runtime will appear in the link command after the standard library, leading to multiple-definition errors for the global 'operator new' and 'operator delete'. Fix this in a painfully simple way, by inserting libclang_rt.asan.a at the start of the link command instead of the end. If we need to do something more clever, we can walk the link command looking for something that resembles libstdc++ and insert libclang_rt.asan.a as late as possible, but the simple solution works for now. llvm-svn: 169310
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