A64: add missing files.

src/a64/codegen-a64.h

Index: src/a64/codegen-a64.h
diff --git a/src/mips/codegen-mips.h b/src/a64/codegen-a64.h
similarity index 94%
copy from src/mips/codegen-mips.h
copy to src/a64/codegen-a64.h
index 240b02ce44ba4e77d84d1b3c5bc800f347bea83f..65e4e6abbca1ece3b5ab67f6c5ae982a8222c7fc 100644
--- a/src/mips/codegen-mips.h
+++ b/src/a64/codegen-a64.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -25,10 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-
-#ifndef V8_MIPS_CODEGEN_MIPS_H_
-#define V8_MIPS_CODEGEN_MIPS_H_
-
+#ifndef V8_A64_CODEGEN_A64_H_
+#define V8_A64_CODEGEN_A64_H_
 
 #include "ast.h"
 #include "ic-inl.h"
@@ -39,8 +37,6 @@ namespace internal {
 // Forward declarations
 class CompilationInfo;
 
-enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
-
 // -------------------------------------------------------------------------
 // CodeGenerator
 
@@ -114,4 +110,4 @@ class MathExpGenerator : public AllStatic {
 
 } }  // namespace v8::internal
 
-#endif  // V8_MIPS_CODEGEN_MIPS_H_
+#endif  // V8_A64_CODEGEN_A64_H_