nir/opcodes: fisfinite32 should return bool32
Otherwise constant-folding will fold it to 0/1 instead of 0/~0.
Fixes: 330e2815 ("nir: add 32-bit bool of fisfinite")
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Otherwise constant-folding will fold it to 0/1 instead of 0/~0.
Fixes: 330e2815 ("nir: add 32-bit bool of fisfinite")