cranelift: Add SIMD icmp comparisons to interpreter

cranelift/interpreter/src/value.rs

@@ -252,6 +252,16 @@ impl Value for DataValue {
                 (DataValue::I64(n), types::I64) => DataValue::I64(n),
                 (DataValue::I64(n), types::I128) => DataValue::I128(n as i128),
                 (DataValue::B(b), t) if t.is_bool() => DataValue::B(b),
+                (DataValue::B(b), t) if t.is_int() => {
+                    let val = if b {
+                        // Bools are represented in memory as all 1's
+                        (1i128 << t.bits()) - 1
+                    } else {
+                        0
+                    };
+                    DataValue::int(val, t)?
+                }
+                (dv, t) if t.is_int() && dv.ty() == t => dv,
                 (dv, _) => unimplemented!("conversion: {} -> {:?}", dv.ty(), kind),
             },
             ValueConversionKind::Truncate(ty) => {