[turbofan] Introduce simplified operator NumberAbs.

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 669 matching lines @@
       return machine()->Float64Mod();
     case IrOpcode::kNumberEqual:
     case IrOpcode::kSpeculativeNumberEqual:
       return machine()->Float64Equal();
     case IrOpcode::kNumberLessThan:
     case IrOpcode::kSpeculativeNumberLessThan:
       return machine()->Float64LessThan();
     case IrOpcode::kNumberLessThanOrEqual:
     case IrOpcode::kSpeculativeNumberLessThanOrEqual:
       return machine()->Float64LessThanOrEqual();
+    case IrOpcode::kNumberAbs:
+      return machine()->Float64Abs();
     case IrOpcode::kNumberAtan:
       return machine()->Float64Atan();
     case IrOpcode::kNumberAtan2:
       return machine()->Float64Atan2();
     case IrOpcode::kNumberCos:
       return machine()->Float64Cos();
     case IrOpcode::kNumberExp:
       return machine()->Float64Exp();
     case IrOpcode::kNumberFround:
       return machine()->TruncateFloat64ToFloat32();
@@ skipping 68 matching lines @@
 }
 
 Node* RepresentationChanger::InsertChangeTaggedToFloat64(Node* node) {
   return jsgraph()->graph()->NewNode(simplified()->ChangeTaggedToFloat64(),
                                      node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8