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