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

src/x64/codegen-x64-inl.h

 // Copyright 2009 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 19 matching lines @@
 #define V8_X64_CODEGEN_X64_INL_H_
 
 namespace v8 {
 namespace internal {
 
 // Platform-specific inline functions.
 
 void DeferredCode::Jump() { UNIMPLEMENTED(); }
 void DeferredCode::Branch(Condition cc) { UNIMPLEMENTED(); }
 
+
+void CodeGenerator::GenerateMathSin(ZoneList<Expression*>* args) {
+  GenerateFastMathOp(SIN, args);
+}
+
+
+void CodeGenerator::GenerateMathCos(ZoneList<Expression*>* args) {
+  GenerateFastMathOp(COS, args);
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODEGEN_X64_INL_H_