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
The Clang built-in function is void __xray_typedevent(size_t, const void *, size_t),
but the LLVM intrinsics has smaller integer types. Since we only allow
64-bit ELF/Mach-O targets, we can change llvm.xray.typedevent to
i64/ptr/i64.
This allows encoding more information and avoids i16 legalization for
many non-X86 targets.
fdrLoggingHandleTypedEvent only supports uint16_t event type.
