Initial patch for a64.

src/full-codegen.h

 // Copyright 2012 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 113 matching lines @@
   static const int kMaxBackEdgeWeight = 127;
 
 #if V8_TARGET_ARCH_IA32
   static const int kBackEdgeDistanceUnit = 100;
 #elif V8_TARGET_ARCH_X64
   static const int kBackEdgeDistanceUnit = 162;
 #elif V8_TARGET_ARCH_ARM
   static const int kBackEdgeDistanceUnit = 142;
 #elif V8_TARGET_ARCH_MIPS
   static const int kBackEdgeDistanceUnit = 142;
+#elif V8_TARGET_ARCH_A64
+// TODO(all): Copied ARM value. Check this is sensible for A64.
+  static const int kBackEdgeDistanceUnit = 142;
 #else
 #error Unsupported target architecture.
 #endif
 
   static const int kBackEdgeEntrySize = 2 * kIntSize + kOneByteSize;
 
  private:
   class Breakable;
   class Iteration;
 
@@ skipping 729 matching lines @@
   }
 
  private:
   Zone* zone_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FULL_CODEGEN_H_