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Remove redundant null pointer check in operator delete
Summary: C89 4.10.3.2 The free function C99 7.20.3.2 The free function C11 7.22.3.3 The free function If ptr is a null pointer, no action shall occur. _aligned_free on MSDN: If memblock is a NULL pointer, this function simply performs no actions. Reviewers: EricWF, mclow.lists, khng300, hotpxl Reviewed By: mclow.lists, khng300, hotpxl Subscribers: lichray, llvm-commits, hotpxl, khng300, christof, ldionne, cfe-commits, libcxx-commits Differential Revision: https://reviews.llvm.org/D52401 llvm-svn: 343503
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