03efee5585
(__HAVE_PTRACE_MACHDEP) and procfs (__HAVE_PROCFS_MACHDEP). These changes will allow platforms like x86 (XMM) and PowerPC (AltiVec) to export extended register sets in a sane manner. * Use __HAVE_PTRACE_MACHDEP to export x86 XMM registers (standard FP + SSE/SSE2) using PT_{GET,SET}XMMREGS (in the machdep ptrace request space). * Use __HAVE_PROCFS_MACHDEP to export x86 XMM registers via /proc/N/xmmregs in procfs.