Merge experimental/a64 to bleeding_edge.

src/platform-posix.cc

 // 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 258 matching lines @@
   if (FLAG_break_on_abort) {
     DebugBreak();
   }
   abort();
 }
 
 
 void OS::DebugBreak() {
 #if V8_HOST_ARCH_ARM
   asm("bkpt 0");
+#elif V8_HOST_ARCH_A64
+  asm("brk 0");
 #elif V8_HOST_ARCH_MIPS
   asm("break");
 #elif V8_HOST_ARCH_IA32
 #if defined(__native_client__)
   asm("hlt");
 #else
   asm("int $3");
 #endif  // __native_client__
 #elif V8_HOST_ARCH_X64
   asm("int $3");
@@ skipping 487 matching lines @@
 
 void Thread::SetThreadLocal(LocalStorageKey key, void* value) {
   pthread_key_t pthread_key = LocalKeyToPthreadKey(key);
   int result = pthread_setspecific(pthread_key, value);
   ASSERT_EQ(0, result);
   USE(result);
 }
 
 
 } }  // namespace v8::internal