[wasm] asm.js: Work around parser converting !0 and !1 to boolean.

test/mjsunit/wasm/asm-wasm.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --validate-asm --allow-natives-syntax
 
 var stdlib = this;
 
 function assertValidAsm(func) {
   assertTrue(%IsAsmWasmCode(func));
@@ skipping 1578 matching lines @@
   "use asm";
   function add(a, b) {
     a = a | 0;
     b = b | 0;
     return (a + b) | 0;
   }
   return add;
 }
 
 assertEquals(7, TestSingleFunctionModule()(3, 4));
+
+
+function TestNotZero() {
+  "use asm";
+  function caller() {
+    if (!0) {
+      return 44;
+    } else {
+      return 55;
+    }
+    return 0;
+  }
+  return {caller: caller};
+}
+
+assertWasm(44, TestNotZero);
+
+
+function TestNotOne() {
+  "use asm";
+  function caller() {
+    if (!1) {
+      return 44;
+    } else {
+      return 55;
+    }
+    return 0;
+  }
+  return {caller: caller};
+}
+
+assertWasm(55, TestNotOne);