BUG: simplify code remove strict aliasing violation

Didn't think the violation could cause issues but apparently some
compilers do mess it up. Also the old code is overly complicated, don't
know what I was thinking ...

Closes numpygh-6251

numpy/core/src/umath/simd.inc.src

@@ -543,8 +543,7 @@ sse2_ordered_cmp_@kind@_@TYPE@(const @type@ a, const @type@ b)
     @vtype@ v = @vpre@_@VOP@_@vsufs@(@vpre@_load_@vsufs@(&a),
                                      @vpre@_load_@vsufs@(&b));
     @vpre@_store_@vsufs@(&tmp, v);
-    return sizeof(@type@) == 4 ?
-        (*(npy_uint32 *)&tmp) & 1 : (*(npy_uint64 *)&tmp) & 1;
+    return !(tmp == 0.);
 }
 
 static void