[turbofan] Add new Float32Abs and Float64Abs operators.

src/math.js

 // Copyright 2012 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.
 
 var rngstate;  // Initialized to a Uint32Array during genesis.
 
 var $abs;
 var $exp;
 var $floor;
 var $max;
 var $min;
 
 (function() {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 var GlobalObject = global.Object;
 var GlobalArray = global.Array;
 
 //-------------------------------------------------------------------
 
 // ECMA 262 - 15.8.2.1
 function MathAbs(x) {
   x = +x;
-  if (x > 0) return x;
-  return 0 - x;
+  return (x > 0) ? x : 0 - x;
 }
 
 // ECMA 262 - 15.8.2.2
 function MathAcosJS(x) {
   return %_MathAcos(+x);
 }
 
 // ECMA 262 - 15.8.2.3
 function MathAsinJS(x) {
   return %_MathAsin(+x);
@@ skipping 317 matching lines @@
 %SetInlineBuiltinFlag(MathTrunc);
 
 // Expose to the global scope.
 $abs = MathAbs;
 $exp = MathExp;
 $floor = MathFloorJS;
 $max = MathMax;
 $min = MathMin;
 
 })();