[types] Use the TypeCache consistently for common types.

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/base/flags.h"
 #include "src/compiler/graph.h"
 #include "src/types.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CompilationDependencies;
-class ZoneTypeCache;
+class TypeCache;
 
 namespace compiler {
 
 
 class Typer {
  public:
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
@@ skipping 19 matching lines @@
   Flags flags() const { return flags_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
   Type::FunctionType* function_type() const { return function_type_; }
 
   Isolate* const isolate_;
   Graph* const graph_;
   Flags const flags_;
   CompilationDependencies* const dependencies_;
   Type::FunctionType* function_type_;
   Decorator* decorator_;
-  ZoneTypeCache const& cache_;
+  TypeCache const& cache_;
 
   Type* singleton_false_;
   Type* singleton_true_;
   Type* signed32ish_;
   Type* unsigned32ish_;
   Type* falsish_;
   Type* truish_;
 
   DISALLOW_COPY_AND_ASSIGN(Typer);
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(Typer::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_TYPER_H_