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MEMORY_BASIC_INFORMATION64 specifies an alignment of 16, but the standard allocator used by containers doesn't honor this. Although 16 is the default alignment size used on Windows for x86_64, it's not for 32-bit x86. clang assumed that the alignment of the structure was as declared, and used an SSE load sequence that required this alignment. AlignedAllocator is a replacement for std::allocator that allows the alignment to be specified. AlignedVector is an std::vector<> that uses AlignedAllocator instead of std::allocator. BUG=chromium:564691 R=scottmg@chromium.org Review URL: https://codereview.chromium.org/1498133002 .