A64: add missing files.

src/a64/debugger-a64.h

Index: src/a64/debugger-a64.h
diff --git a/src/extensions/gc-extension.h b/src/a64/debugger-a64.h
similarity index 75%
copy from src/extensions/gc-extension.h
copy to src/a64/debugger-a64.h
index e412b92a4d997aad87160ddd789b85419bdf3037..50480cc268a49f53fafc1650e79d73de573524ed 100644
--- a/src/extensions/gc-extension.h
+++ b/src/a64/debugger-a64.h
@@ -1,4 +1,4 @@
-// Copyright 2010 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:
@@ -25,23 +25,32 @@
 // (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_EXTENSIONS_GC_EXTENSION_H_
-#define V8_EXTENSIONS_GC_EXTENSION_H_
+#ifndef V8_A64_DEBUGGER_A64_H_
+#define V8_A64_DEBUGGER_A64_H_
 
-#include "v8.h"
+#if defined(USE_SIMULATOR)
+
+#include "globals.h"
+#include "utils.h"
+#include "a64/constants-a64.h"
+#include "a64/simulator-a64.h"
 
 namespace v8 {
 namespace internal {
 
-class GCExtension : public v8::Extension {
+
+class Debugger : public Simulator {
  public:
-  explicit GCExtension(const char* source) : v8::Extension("v8/gc", source) {}
-  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
-      v8::Handle<v8::String> name);
-  static void GC(const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void Register();
+  Debugger(Decoder* decoder, FILE* stream = stdout)
+    : Simulator(decoder, NULL, stream) {}
+
+  // Functions overloading.
+  void VisitException(Instruction* instr);
 };
 
+
 } }  // namespace v8::internal
 
-#endif  // V8_EXTENSIONS_GC_EXTENSION_H_
+#endif  // USE_SIMULATOR
+
+#endif  // V8_A64_DEBUGGER_A64_H_