Collect type feedback on result of Math.[round|ceil|floor]

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;
@@ skipping 34 matching lines @@
 // The naming of y and x matches the spec, as does the order in which
 // ToNumber (valueOf) is called.
 function MathAtan2JS(y, x) {
   y = +y;
   x = +x;
   return %_MathAtan2(y, x);
 }
 
 // ECMA 262 - 15.8.2.6
 function MathCeil(x) {
-  return -%_MathFloor(-x);
+  return -MathFloorJS(-x);
 }
 
 // ECMA 262 - 15.8.2.8
 function MathExp(x) {
   return %MathExpRT(TO_NUMBER_INLINE(x));
 }
 
 // ECMA 262 - 15.8.2.9
 function MathFloorJS(x) {
-  return %_MathFloor(+x);
+  return %MathFloor(+x);
 }
 
 // ECMA 262 - 15.8.2.10
 function MathLog(x) {
   return %_MathLogRT(TO_NUMBER_INLINE(x));
 }
 
 // ECMA 262 - 15.8.2.11
 function MathMax(arg1, arg2) {  // length == 2
   var length = %_ArgumentsLength();
@@ skipping 84 matching lines @@
   x = +x;
   if (x > 0) return 1;
   if (x < 0) return -1;
   // -0, 0 or NaN.
   return x;
 }
 
 // ES6 draft 09-27-13, section 20.2.2.34.
 function MathTrunc(x) {
   x = +x;
-  if (x > 0) return %_MathFloor(x);
-  if (x < 0) return -%_MathFloor(-x);
+  if (x > 0) return MathFloorJS(x);
+  if (x < 0) return -MathFloorJS(-x);
   // -0, 0 or NaN.
   return x;
 }
 
 // ES6 draft 09-27-13, section 20.2.2.33.
 function MathTanh(x) {
   if (!IS_NUMBER(x)) x = NonNumberToNumber(x);
   // Idempotent for +/-0.
   if (x === 0) return x;
   // Returns +/-1 for +/-Infinity.
@@ skipping 172 matching lines @@
 %SetInlineBuiltinFlag(MathTrunc);
 
 // Expose to the global scope.
 $abs = MathAbs;
 $exp = MathExp;
 $floor = MathFloorJS;
 $max = MathMax;
 $min = MathMin;
 
 })();