In avx2-insts.lisp, vbroadcastss and vbroadcastsd mistakenly checked
(or (xmm-register-p src) (zmm-register-p dst)) to decide whether to
emit EVEX. Because f32.4-broadcast passes src in single-reg (XMM),
this caused 128-bit and 256-bit AVX broadcast instructions to be encoded
with EVEX prefixes (62 f2 ...), raising SIGILL on hosts lacking AVX-512
support.
Fix the condition to check (zmm-register-p dst). Standard emit-avx2-inst
already auto-promotes operands using registers 16-31 to EVEX.
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