[builtins] Introduce proper Float64Cos and Float64Sin.

src/crankshaft/mips64/lithium-mips64.h

Index: src/crankshaft/mips64/lithium-mips64.h
diff --git a/src/crankshaft/mips64/lithium-mips64.h b/src/crankshaft/mips64/lithium-mips64.h
index cc44ae6f436d1ef6f632737380889c72eb903f58..45bafc3227a52ede444bcfdfd5c4958bbaec58ac 100644
--- a/src/crankshaft/mips64/lithium-mips64.h
+++ b/src/crankshaft/mips64/lithium-mips64.h
@@ -99,6 +99,8 @@ class LCodeGen;
   V(LoadNamedField)                          \
   V(LoadNamedGeneric)                        \
   V(MathAbs)                                 \
+  V(MathCos)                                 \
+  V(MathSin)                                 \
   V(MathExp)                                 \
   V(MathClz32)                               \
   V(MathFloor)                               \
@@ -900,6 +902,24 @@ class LMathClz32 final : public LTemplateInstruction<1, 1, 0> {
   DECLARE_CONCRETE_INSTRUCTION(MathClz32, "math-clz32")
 };
 
+class LMathCos final : public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LMathCos(LOperand* value) { inputs_[0] = value; }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(MathCos, "math-cos")
+};
+
+class LMathSin final : public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LMathSin(LOperand* value) { inputs_[0] = value; }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(MathSin, "math-sin")
+};
+
 class LMathExp final : public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LMathExp(LOperand* value) { inputs_[0] = value; }
@@ -2536,6 +2556,8 @@ class LChunkBuilder final : public LChunkBuilderBase {
   LInstruction* DoMathFround(HUnaryMathOperation* instr);
   LInstruction* DoMathAbs(HUnaryMathOperation* instr);
   LInstruction* DoMathLog(HUnaryMathOperation* instr);
+  LInstruction* DoMathCos(HUnaryMathOperation* instr);
+  LInstruction* DoMathSin(HUnaryMathOperation* instr);
   LInstruction* DoMathExp(HUnaryMathOperation* instr);
   LInstruction* DoMathSqrt(HUnaryMathOperation* instr);
   LInstruction* DoMathPowHalf(HUnaryMathOperation* instr);