[Bug 293845] Compilation fails with "use of undeclared identifier '__builtin_ia32_readeflags_u32'" on aarch64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293845

--- Comment #3 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Mark Millard from comment #2)

Here is the specific code taht leads to attempted use of
x86intrin.h :

// See if we should use the x86 TSC register for timing.
#if defined(PXR_ARCH_PREFER_TSC_TIMING) &&                              \
    defined(ARCH_OS_LINUX) &&                                           \
    defined(ARCH_CPU_INTEL) &&                                          \
    (defined(ARCH_COMPILER_CLANG) || defined(ARCH_COMPILER_GCC))
#define ARCH_USE_TSC_TIMING 1
#else
#define ARCH_USE_TSC_TIMING 0
#endif

#if ARCH_USE_TSC_TIMING
#include <x86intrin.h>
#endif

Somehow you have ARCH_CPU_INTEL defined for aarch64 builds
(among other things that may or may not be correct).

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