[builtins] Introduce proper Float64Cos and Float64Sin.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 4a41fe4c7f1f6aab991cd7e188a79993bb47cd27..343970b77b3f6b17f2ce3f0b06deaf7245e0f000 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -2421,6 +2421,18 @@ void Builtins::Generate_MathClz32(CodeStubAssembler* assembler) {
   }
 }
 
+// ES6 section 20.2.2.12 Math.cos ( x )
+void Builtins::Generate_MathCos(CodeStubAssembler* assembler) {
+  using compiler::Node;
+
+  Node* x = assembler->Parameter(1);
+  Node* context = assembler->Parameter(4);
+  Node* x_value = assembler->TruncateTaggedToFloat64(context, x);
+  Node* value = assembler->Float64Cos(x_value);
+  Node* result = assembler->ChangeFloat64ToTagged(value);
+  assembler->Return(result);
+}
+
 // ES6 section 20.2.2.14 Math.exp ( x )
 void Builtins::Generate_MathExp(CodeStubAssembler* assembler) {
   using compiler::Node;
@@ -2525,6 +2537,18 @@ void Builtins::Generate_MathRound(CodeStubAssembler* assembler) {
   Generate_MathRoundingOperation(assembler, &CodeStubAssembler::Float64Round);
 }
 
+// ES6 section 20.2.2.30 Math.sin ( x )
+void Builtins::Generate_MathSin(CodeStubAssembler* assembler) {
+  using compiler::Node;
+
+  Node* x = assembler->Parameter(1);
+  Node* context = assembler->Parameter(4);
+  Node* x_value = assembler->TruncateTaggedToFloat64(context, x);
+  Node* value = assembler->Float64Sin(x_value);
+  Node* result = assembler->ChangeFloat64ToTagged(value);
+  assembler->Return(result);
+}
+
 // ES6 section 20.2.2.32 Math.sqrt ( x )
 void Builtins::Generate_MathSqrt(CodeStubAssembler* assembler) {
   using compiler::Node;