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XRayFileHeader storage was obtained from std::aligned_storage using its default alignment and not the struct's alignment requirement. This was causing a bus error on AArch32, on armv8 machines, where vld1.64/vst1.64 instructions with 128-bit alignment requirement were being used to copy XRayFileHeader. There is still another issue with fdr-single-thread.cpp test on armv7. Now it runs until completion and produces a valid log file, but for some reason the function name appears as _end in it, instead of the expected mangled fn name. Reviewed By: MaskRay Differential Revision: https://reviews.llvm.org/D155013