VM: Remove unused optimization of merging of sin/cos.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
diff --git a/runtime/vm/code_generator.cc b/runtime/vm/code_generator.cc
index 495277caf5934a618c853e0374220e4e1efcfaa2..6e4cd1189ce981e0f6e149acc5c3340f04c0565b 100644
--- a/runtime/vm/code_generator.cc
+++ b/runtime/vm/code_generator.cc
@@ -2256,14 +2256,6 @@ double DartModulo(double left, double right) {
 }
 
 
-void SinCos(double arg, double* cos_res, double* sin_res) {
-  // The compiler may merge the calls to sincos, if supported. This
-  // typically occurs only when compiling for 64-bit targets.
-  *cos_res = cos(arg);
-  *sin_res = sin(arg);
-}
-
-
 // Update global type feedback recorded for a field recording the assignment
 // of the given value.
 //   Arg0: Field object;