[turbofan] Unify BooleanToNumber, StringToNumber and PlainPrimitiveToNumber.

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 910 matching lines @@
     return Changed(input);
   }
   if (input_type->Is(Type::Undefined())) {
     // JSToNumber(undefined) => #NaN
     return Replace(jsgraph()->NaNConstant());
   }
   if (input_type->Is(Type::Null())) {
     // JSToNumber(null) => #0
     return Replace(jsgraph()->ZeroConstant());
   }
-  if (input_type->Is(Type::Boolean())) {
-    // JSToNumber(x:boolean) => BooleanToNumber(x)
-    return Replace(graph()->NewNode(simplified()->BooleanToNumber(), input));
-  }
-  if (input_type->Is(Type::String())) {
-    // JSToNumber(x:string) => StringToNumber(x)
-    return Replace(graph()->NewNode(simplified()->StringToNumber(), input));
-  }
   return NoChange();
 }
 
 
 Reduction JSTypedLowering::ReduceJSToNumber(Node* node) {
   // Try to reduce the input first.
   Node* const input = node->InputAt(0);
   Reduction reduction = ReduceJSToNumberInput(input);
   if (reduction.Changed()) {
     ReplaceWithValue(node, reduction.replacement());
@@ skipping 1123 matching lines @@
 }
 
 
 CompilationDependencies* JSTypedLowering::dependencies() const {
   return dependencies_;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8