[builtins] Introduce proper Float64Cos and Float64Sin.

src/crankshaft/mips/lithium-mips.cc

Index: src/crankshaft/mips/lithium-mips.cc
diff --git a/src/crankshaft/mips/lithium-mips.cc b/src/crankshaft/mips/lithium-mips.cc
index ea14026d9a46ace973cf79d74fe157b90c90ca75..c50478e4dd6c3fa82a19b7f0cc75cf31a0342e02 100644
--- a/src/crankshaft/mips/lithium-mips.cc
+++ b/src/crankshaft/mips/lithium-mips.cc
@@ -1074,6 +1074,10 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
       return DoMathAbs(instr);
     case kMathLog:
       return DoMathLog(instr);
+    case kMathCos:
+      return DoMathCos(instr);
+    case kMathSin:
+      return DoMathSin(instr);
     case kMathExp:
       return DoMathExp(instr);
     case kMathSqrt:
@@ -1103,6 +1107,19 @@ LInstruction* LChunkBuilder::DoMathClz32(HUnaryMathOperation* instr) {
   return DefineAsRegister(result);
 }
 
+LInstruction* LChunkBuilder::DoMathCos(HUnaryMathOperation* instr) {
+  DCHECK(instr->representation().IsDouble());
+  DCHECK(instr->value()->representation().IsDouble());
+  LOperand* input = UseFixedDouble(instr->value(), f4);
+  return MarkAsCall(DefineFixedDouble(new (zone()) LMathCos(input), f4), instr);
+}
+
+LInstruction* LChunkBuilder::DoMathSin(HUnaryMathOperation* instr) {
+  DCHECK(instr->representation().IsDouble());
+  DCHECK(instr->value()->representation().IsDouble());
+  LOperand* input = UseFixedDouble(instr->value(), f4);
+  return MarkAsCall(DefineFixedDouble(new (zone()) LMathSin(input), f4), instr);
+}
 
 LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
   DCHECK(instr->representation().IsDouble());