[builtins] Introduce proper Float64Cos and Float64Sin.

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index 9a0b54037fc1fa8348ea226bf047256a91011db5..8d4088b599ec038dddb0e9ce74a4d7f2eaf1952c 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -3693,6 +3693,19 @@ void LCodeGen::DoPower(LPower* instr) {
   }
 }
 
+void LCodeGen::DoMathCos(LMathCos* instr) {
+  __ PrepareCallCFunction(0, 1, scratch0());
+  __ MovToFloatParameter(ToDoubleRegister(instr->value()));
+  __ CallCFunction(ExternalReference::ieee754_cos_function(isolate()), 0, 1);
+  __ MovFromFloatResult(ToDoubleRegister(instr->result()));
+}
+
+void LCodeGen::DoMathSin(LMathSin* instr) {
+  __ PrepareCallCFunction(0, 1, scratch0());
+  __ MovToFloatParameter(ToDoubleRegister(instr->value()));
+  __ CallCFunction(ExternalReference::ieee754_sin_function(isolate()), 0, 1);
+  __ MovFromFloatResult(ToDoubleRegister(instr->result()));
+}
 
 void LCodeGen::DoMathExp(LMathExp* instr) {
   __ PrepareCallCFunction(0, 1, scratch0());