[Bug 275322] Improper handling of mxcsr register during debug (gdb/lldb)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275322

--- Comment #5 from Cheyenne Wills <cheyenne.wills@gmail.com> ---
(In reply to Konstantin Belousov from comment #3)

This is failing on an AMD Ryzen 9 5900X 12-Core Processor

    CPU family:          25
    Model:               33

Flags:               fpu de tsc msr pae mce cx8 apic mca cmov pat clflush mm
                         x fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp
lm
                          constant_tsc rep_good nopl nonstop_tsc cpuid
extd_apic
                         id tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1
s
                         se4_2 movbe popcnt aes xsave avx f16c rdrand
hypervisor
                          lahf_lm cmp_legacy abm sse4a misalignsse
3dnowprefetch
                          bpext ibpb vmmcall fsgsbase bmi1 avx2 bmi2 erms
rdseed
                          adx clflushopt clwb sha_ni xsaveopt xsavec xgetbv1
clz
                         ero xsaveerptr arat vaes vpclmulqdq rdpid fsrm

Running xen-4.17.3 with a gentoo DOM0 

Running the same test using a different guest (Linux) did not show the same
failure.

I copied the freebsd disk image over to a different system (running kvm on a
Intel Xeon processor) and was unable to reproduce the problem.

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