[turbofan] Unify number operation typing rules.

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/compiler/graph.h"
 #include "src/compiler/operation-typer.h"
 #include "src/types.h"
@@ skipping 30 matching lines @@
 
   Isolate* const isolate_;
   Graph* const graph_;
   Decorator* decorator_;
   TypeCache const& cache_;
   OperationTyper operation_typer_;
 
   Type* singleton_false_;
   Type* singleton_true_;
   Type* singleton_the_hole_;
-  Type* signed32ish_;
-  Type* unsigned32ish_;
   Type* falsish_;
   Type* truish_;
 
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPER_H_