[builtins] Introduce proper Float64Cos and Float64Sin.

src/compiler/machine-operator-reducer.cc

Index: src/compiler/machine-operator-reducer.cc
diff --git a/src/compiler/machine-operator-reducer.cc b/src/compiler/machine-operator-reducer.cc
index 07d6820f069ebcf4d878269770fb6abed934784c..f0032d7d05bb31037f2a7b2c02a6f1dec14e9a2f 100644
--- a/src/compiler/machine-operator-reducer.cc
+++ b/src/compiler/machine-operator-reducer.cc
@@ -401,6 +401,11 @@ Reduction MachineOperatorReducer::Reduce(Node* node) {
       if (m.HasValue()) return ReplaceFloat64(base::ieee754::atanh(m.Value()));
       break;
     }
+    case IrOpcode::kFloat64Cos: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(base::ieee754::cos(m.Value()));
+      break;
+    }
     case IrOpcode::kFloat64Exp: {
       Float64Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceFloat64(base::ieee754::exp(m.Value()));
@@ -436,6 +441,11 @@ Reduction MachineOperatorReducer::Reduce(Node* node) {
       if (m.HasValue()) return ReplaceFloat64(base::ieee754::cbrt(m.Value()));
       break;
     }
+    case IrOpcode::kFloat64Sin: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(base::ieee754::sin(m.Value()));
+      break;
+    }
     case IrOpcode::kChangeFloat32ToFloat64: {
       Float32Matcher m(node->InputAt(0));
       if (m.HasValue()) return ReplaceFloat64(m.Value());