[builtins] Introduce proper Float64Cos and Float64Sin.

src/crankshaft/arm64/lithium-arm64.h

Index: src/crankshaft/arm64/lithium-arm64.h
diff --git a/src/crankshaft/arm64/lithium-arm64.h b/src/crankshaft/arm64/lithium-arm64.h
index 98902434a9260f1ae68029e2bddaf882bf43aff1..0a7c4523785665d96f8bbea11dc08f8ff7d97790 100644
--- a/src/crankshaft/arm64/lithium-arm64.h
+++ b/src/crankshaft/arm64/lithium-arm64.h
@@ -104,6 +104,8 @@ class LCodeGen;
   V(MathAbs)                                 \
   V(MathAbsTagged)                           \
   V(MathClz32)                               \
+  V(MathCos)                                 \
+  V(MathSin)                                 \
   V(MathExp)                                 \
   V(MathFloorD)                              \
   V(MathFloorI)                              \
@@ -1763,6 +1765,20 @@ class LMathAbsTagged: public LTemplateInstruction<1, 2, 3> {
   DECLARE_HYDROGEN_ACCESSOR(UnaryMathOperation)
 };
 
+class LMathCos final : public LUnaryMathOperation<0> {
+ public:
+  explicit LMathCos(LOperand* value) : LUnaryMathOperation<0>(value) {}
+
+  DECLARE_CONCRETE_INSTRUCTION(MathCos, "math-cos")
+};
+
+class LMathSin final : public LUnaryMathOperation<0> {
+ public:
+  explicit LMathSin(LOperand* value) : LUnaryMathOperation<0>(value) {}
+
+  DECLARE_CONCRETE_INSTRUCTION(MathSin, "math-sin")
+};
+
 class LMathExp final : public LUnaryMathOperation<0> {
  public:
   explicit LMathExp(LOperand* value) : LUnaryMathOperation<0>(value) {}