[asm] Fix lots of invalid asm.js tests

test/mjsunit/asm/math-ceil.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) {
   "use asm";
 
   var ceil = stdlib.Math.ceil;
 
   // f: double -> float
   function f(a) {
     a = +a;
-    return ceil(a);
+    return +ceil(a);
   }
 
   return { f: f };
 }
 
 var f = Module({ Math: Math }).f;
 
 assertTrue(isNaN(f(NaN)));
 assertTrue(isNaN(f(undefined)));
 assertTrue(isNaN(f(function() {})));
 
 assertEquals(0,                   f(0));
 assertEquals(+0,                  f(+0));
 assertEquals(-0,                  f(-0));
 assertEquals(1,                   f(0.49999));
 assertEquals(1,                   f(0.6));
 assertEquals(1,                   f(0.5));
 assertEquals(-0,                  f(-0.1));
 assertEquals(-0,                  f(-0.5));
 assertEquals(-0,                  f(-0.6));
 assertEquals(-1,                  f(-1.6));
 assertEquals(-0,                  f(-0.50001));
 
 assertEquals("Infinity", String(f(Infinity)));
 assertEquals("-Infinity", String(f(-Infinity)));