Dump of file fixture: the artificial "rot probe" (review-k1-avx.md R4).
Synthetic, not from a real build: an own-code object (ggml-fake-red.obj,
not msvcprt/MSVCRT and not wmemcmp/memcmp) that reaches a VEX instruction
with NO preceding __isa_available/__isa_enabled/_Avx2WmemEnabled load
anywhere in the owning function. This must always come out RED: if a
future change to the guard's decision logic ever lets this fixture pass,
the allowlist or the dominance check has been loosened past the point
review-k1-avx.md judged safe.

  0000000180050000: 48 89 5C 24 08     mov         qword ptr [rsp+8],rbx
  0000000180050005: C5 F9 6E D8        vmovd       xmm3,eax
  000000018005000A: C3                 ret
