[PATCH] [AVX512]For vector compare to mask register, UNSPEC is needed instead of comparison operator [PR96243]

[Hongtao Liu]

Hi:
  The issue is described in the bugzilla.
  Bootstrap is ok, regression test for i386/x86-64 backend is ok.
 Ok for trunk?

ChangeLog
gcc/
        PR target/96551
        * config/i386/sse.md (vec_unpacku_float_hi_v16si): For vector
        compare to integer mask, don't use gen_rtx_LT , use
        ix86_expand_mask_vec_cmp instead.
        (vec_unpacku_float_hi_v16si): Ditto.

gcc/testsuite
        * gcc.target/i386/pr96551-1.c: New test.
        * gcc.target/i386/pr96551-2.c: New test.

-- 
BR,
Hongtao
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