[builtins] Introduce proper Float64Cos and Float64Sin.

src/compiler/machine-operator.h

Index: src/compiler/machine-operator.h
diff --git a/src/compiler/machine-operator.h b/src/compiler/machine-operator.h
index 2b19d93e281c9e568278582e9317f33578ae4be4..8ea60dbeff00c612e962a9743f1f1432fe830f84 100644
--- a/src/compiler/machine-operator.h
+++ b/src/compiler/machine-operator.h
@@ -373,7 +373,11 @@ class MachineOperatorBuilder final : public ZoneObject {
   const Operator* Float64Atan2();
   const Operator* Float64Atanh();
 
-  // Floating point exponential functions.
+  // Floating point trigonometric functions (double-precision).
+  const Operator* Float64Cos();
+  const Operator* Float64Sin();
+
+  // Floating point exponential functions (double-precision).
   const Operator* Float64Exp();
 
   // Floating point logarithm (double-precision).