[turbofan] Improve typing of JSToNumber.

src/compiler/typer.h

 // 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.
 
 #ifndef V8_COMPILER_TYPER_H_
 #define V8_COMPILER_TYPER_H_
 
 #include "src/v8.h"
 
 #include "src/compiler/graph.h"
@@ skipping 20 matching lines @@
 
  private:
   class Visitor;
   class Decorator;
 
   Graph* graph_;
   MaybeHandle<Context> context_;
   Decorator* decorator_;
 
   Zone* zone_;
+  Type* boolean_or_number;
+  Type* undefined_or_null;
+  Type* undefined_or_number;
   Type* negative_signed32;
   Type* non_negative_signed32;
-  Type* undefined_or_null;
   Type* singleton_false;
   Type* singleton_true;
   Type* singleton_zero;
   Type* singleton_one;
   Type* zero_or_one;
   Type* zeroish;
   Type* signed32ish;
   Type* unsigned32ish;
   Type* falsish;
   Type* integer;
@@ skipping 12 matching lines @@
   ZoneVector<Handle<Object> > weaken_min_limits_;
   ZoneVector<Handle<Object> > weaken_max_limits_;
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPER_H_