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[lldb] [Process] Introduce common helpers to split/recombine YMM data
Introduce two common helpers to take care of splitting and recombining YMM registers to/from XSAVE-like data. Since FreeBSD, Linux and NetBSD all use XSAVE-like data structures but with potentially different field layouts, the function takes two pointers -- to XMM register and to YMM high bits, and copies the data from/to YMMReg type. While at it, remove support for big endian. To mine and Pavel Labath's combined knowledge, there is no such thing on x86. Furthermore, assuming that the YMM register data would be swapped for big endian seems to be a weird assumption. Differential Revision: https://reviews.llvm.org/D63610 llvm-svn: 364042
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