A64: add missing files.

src/a64/lithium-gap-resolver-a64.h

Index: src/a64/lithium-gap-resolver-a64.h
diff --git a/src/arm/lithium-gap-resolver-arm.h b/src/a64/lithium-gap-resolver-a64.h
similarity index 83%
copy from src/arm/lithium-gap-resolver-arm.h
copy to src/a64/lithium-gap-resolver-a64.h
index 9dd09c8d03b80da4bc79c9e166a6ee983bff34ff..fb3281212ffa1648ef142788a5fd732580c943b7 100644
--- a/src/arm/lithium-gap-resolver-arm.h
+++ b/src/a64/lithium-gap-resolver-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:
@@ -25,8 +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_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
-#define V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
+#ifndef V8_A64_LITHIUM_GAP_RESOLVER_A64_H_
+#define V8_A64_LITHIUM_GAP_RESOLVER_A64_H_
 
 #include "v8.h"
 
@@ -65,9 +65,15 @@ class LGapResolver BASE_EMBEDDED {
   // Emit a move and remove it from the move graph.
   void EmitMove(int index);
 
+  // Emit a move from one stack slot to another.
+  void EmitStackSlotMove(int index);
+
   // Verify the move list before performing moves.
   void Verify();
 
+  // Register used to break cycle in moves list.
+  static const Register kSavedValue;
+
   LCodeGen* cgen_;
 
   // List of moves not yet resolved.
@@ -76,8 +82,12 @@ class LGapResolver BASE_EMBEDDED {
   int root_index_;
   bool in_cycle_;
   LOperand* saved_destination_;
+
+  // We use the root register as a scratch in a few places. When that happens,
+  // this flag is set to indicate that it needs to be restored.
+  bool need_to_restore_root_;
 };
 
 } }  // namespace v8::internal
 
-#endif  // V8_ARM_LITHIUM_GAP_RESOLVER_ARM_H_
+#endif  // V8_A64_LITHIUM_GAP_RESOLVER_A64_H_