[wasm] [asm.js] Fix various asm.js issues.

test/mjsunit/wasm/asm-wasm-u32.js

 // Copyright 2016 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
 
 function WrapInAsmModule(func) {
   function MODULE_NAME(stdlib) {
     "use asm";
     var imul = stdlib.Math.imul;
@@ skipping 139 matching lines @@
 
 function u32_gteq(a, b) {
   a = a | 0;
   b = b | 0;
   if ((a >>> 0) >= (b >>> 0)) {
     return 1;
   }
   return 0;
 }
 
+function u32_neg(a) {
+  a = a | 0;
+  return (-a) | 0;
+}
+
+function u32_invert(a) {
+  a = a | 0;
+  return (~a) | 0;
+}
+
 
 var inputs = [
   0, 1, 2, 3, 4,
   10, 20, 30, 31, 32, 33, 100, 2000,
   30000, 400000, 5000000,
   100000000, 2000000000,
   2147483646,
   2147483647,
   2147483648,
   2147483649,
@@ skipping 25 matching lines @@
   u32_xor,
   u32_shl,
   u32_shr,
   u32_sar,
   u32_eq,
   u32_ne,
   u32_lt,
   u32_lteq,
   u32_gt,
   u32_gteq,
+  u32_neg,
+  u32_invert,
   // TODO(titzer): u32_min
   // TODO(titzer): u32_max
   // TODO(titzer): u32_abs
 ];
 
 (function () {
   for (func of funcs) {
     RunAsmJsTest(WrapInAsmModule(func), function (module) {
       for (a of inputs) {
         for (b of inputs) {
           var expected = func(a, b);
           assertEquals(expected, module.main(a, b));
         }
       }
     });
   }
 
 })();