[arm] Fix recognition of VNEG.

test/mjsunit/asm/float64mul.js

 // Copyright 2014 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.
 
 function Module(stdlib, foreign, heap) {
   "use asm";
   function f1(i) {
     i = +i;
     return +(i * -1);
   }
   function f2(i) {
     i = +i;
     return +(-1 * i);
   }
-  return { f1: f1, f2: f2 };
+  function f3(i) {
+    i = +i;
+    return +(-i);
+  }
+  return { f1: f1, f2: f2, f3: f3 };
 }
 
 var m = Module(this, {}, new ArrayBuffer(64 * 1024));
 
 assertEquals(NaN, m.f1(NaN));
 assertEquals(NaN, m.f2(NaN));
+assertEquals(NaN, m.f3(NaN));
 assertEquals(Infinity, 1 / m.f1(-0));
 assertEquals(Infinity, 1 / m.f2(-0));
+assertEquals(Infinity, 1 / m.f3(-0));
 assertEquals(Infinity, m.f1(-Infinity));
 assertEquals(Infinity, m.f2(-Infinity));
+assertEquals(Infinity, m.f3(-Infinity));
 assertEquals(-Infinity, 1 / m.f1(0));
 assertEquals(-Infinity, 1 / m.f2(0));
+assertEquals(-Infinity, 1 / m.f3(0));
 assertEquals(-Infinity, m.f1(Infinity));
 assertEquals(-Infinity, m.f2(Infinity));
+assertEquals(-Infinity, m.f3(Infinity));
 for (var i = -2147483648; i < 2147483648; i += 3999777) {
   assertEquals(-i, m.f1(i));
   assertEquals(-i, m.f2(i));
+  assertEquals(-i, m.f3(i));
 }