vbinary and vunary microkernels assert pointers are not NULL

PiperOrigin-RevId: 319614242
diff --git a/src/f32-vbinary/vop-wasmsimd.c.in b/src/f32-vbinary/vop-wasmsimd.c.in
index 50c59c8..025ced0 100644
--- a/src/f32-vbinary/vop-wasmsimd.c.in
+++ b/src/f32-vbinary/vop-wasmsimd.c.in
@@ -37,6 +37,9 @@
 {
   assert(n != 0);
   assert(n % sizeof(float) == 0);
+  assert(a != NULL);
+  assert(b != NULL);
+  assert(y != NULL);
 
   $if ACTIVATION == "MINMAX":
     const v128_t vy_min = wasm_v32x4_load_splat(&params->scalar.min);