[turbofan] Remove mutual recursion in typed-lowering of JSToNumber input.

src/compiler/js-typed-lowering.cc

 // Copyright 2014 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/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/linkage.h"
@@ skipping 699 matching lines @@
         NodeProperties::SetType(input, input_type);
       }
     }
     ReplaceWithValue(node, input);
     return Replace(input);
   }
   return NoChange();
 }
 
 Reduction JSTypedLowering::ReduceJSToNumberInput(Node* input) {
-  if (input->opcode() == IrOpcode::kJSToNumber) {
-    // Recursively try to reduce the input first.
-    Reduction result = ReduceJSToNumber(input);
-    if (result.Changed()) return result;
-    return Changed(input);  // JSToNumber(JSToNumber(x)) => JSToNumber(x)
-  }
   // Check for ToNumber truncation of signaling NaN to undefined mapping.
   if (input->opcode() == IrOpcode::kSelect) {
     Node* check = NodeProperties::GetValueInput(input, 0);
     Node* vtrue = NodeProperties::GetValueInput(input, 1);
     Type* vtrue_type = NodeProperties::GetType(vtrue);
     Node* vfalse = NodeProperties::GetValueInput(input, 2);
     Type* vfalse_type = NodeProperties::GetType(vfalse);
     if (vtrue_type->Is(Type::Undefined()) && vfalse_type->Is(Type::Number())) {
       if (check->opcode() == IrOpcode::kNumberIsHoleNaN &&
           check->InputAt(0) == vfalse) {
@@ skipping 1097 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8