[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/compiler/representation-change.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/representation-change.h"
 
 #include <sstream>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 641 matching lines @@
     case IrOpcode::kNumberDivide:
       return machine()->Float64Div();
     case IrOpcode::kNumberModulus:
       return machine()->Float64Mod();
     case IrOpcode::kNumberEqual:
       return machine()->Float64Equal();
     case IrOpcode::kNumberLessThan:
       return machine()->Float64LessThan();
     case IrOpcode::kNumberLessThanOrEqual:
       return machine()->Float64LessThanOrEqual();
+    case IrOpcode::kNumberAtan:
+      return machine()->Float64Atan();
+    case IrOpcode::kNumberAtan2:
+      return machine()->Float64Atan2();
     case IrOpcode::kNumberLog:
       return machine()->Float64Log();
     case IrOpcode::kNumberLog1p:
       return machine()->Float64Log1p();
     default:
       UNREACHABLE();
       return nullptr;
   }
 }
 
@@ skipping 40 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8