Port to C++11 nullptr keyword
Performed using modernize-use-nullptr from clang-tidy. https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-nullptr.html
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Performed using modernize-use-nullptr from clang-tidy. https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-nullptr.html