[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 2656e48682f29cbedc2fe6e93c9bb224f6a6e5ff..58674032129cf33013f1d1326819350c47a8f4cf 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -1455,6 +1455,14 @@ void InstructionSelector::VisitFloat64Neg(Node* node) {
   VisitRR(this, kArmVnegF64, node);
 }
 
+void InstructionSelector::VisitFloat64Ieee754Binop(Node* node,
+                                                   InstructionCode opcode) {
+  ArmOperandGenerator g(this);
+  Emit(opcode, g.DefineAsFixed(node, d0), g.UseFixed(node->InputAt(0), d0),
+       g.UseFixed(node->InputAt(1), d1))
+      ->MarkAsCall();
+}
+
 void InstructionSelector::VisitFloat64Ieee754Unop(Node* node,
                                                   InstructionCode opcode) {
   ArmOperandGenerator g(this);