Optimize Math.sin and Math.cos by avoiding runtime calls.

src/math.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 65 matching lines @@
 
 // ECMA 262 - 15.8.2.6
 function MathCeil(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
   return %Math_ceil(x);
 }
 
 // ECMA 262 - 15.8.2.7
 function MathCos(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
-  return %Math_cos(x);
+  return %_Math_cos(x);
 }
 
 // ECMA 262 - 15.8.2.8
 function MathExp(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
   return %Math_exp(x);
 }
 
 // ECMA 262 - 15.8.2.9
 function MathFloor(x) {
@@ skipping 53 matching lines @@
 
 // ECMA 262 - 15.8.2.15
 function MathRound(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
   return %Math_round(x);
 }
 
 // ECMA 262 - 15.8.2.16
 function MathSin(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
-  return %Math_sin(x);
+  return %_Math_sin(x);
 }
 
 // ECMA 262 - 15.8.2.17
 function MathSqrt(x) {
   if (!IS_NUMBER(x)) x = ToNumber(x);
   return %Math_sqrt(x);
 }
 
 // ECMA 262 - 15.8.2.18
 function MathTan(x) {
@@ skipping 62 matching lines @@
     "tan", MathTan,
     "atan2", MathAtan2,
     "pow", MathPow,
     "max", MathMax,
     "min", MathMin
   ));
 };
 
 
 SetupMath();