Porting r10023 and r10054 to x64 (pointer cache for external strings).

src/codegen.h

Index: src/codegen.h
diff --git a/src/codegen.h b/src/codegen.h
index e6d5399b5ccae33fde24617b9285afbf46b4431b..5360d3ef3caae22c24ccbdda28488770a8823d97 100644
--- a/src/codegen.h
+++ b/src/codegen.h
@@ -94,23 +94,6 @@ class ElementsTransitionGenerator : public AllStatic {
   DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
 };
 
-
-class StringCharLoadGenerator : public AllStatic {
- public:
-  // Generates the code for handling different string types and loading the
-  // indexed character into |result|.  We expect |index| as untagged input and
-  // |result| as untagged output.
-  static void Generate(MacroAssembler* masm,
-                       Factory* factory,
-                       Register string,
-                       Register index,
-                       Register result,
-                       Label* call_runtime);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(StringCharLoadGenerator);
-};
-
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_H_