A64: Fix some compile errors when building for Android.

src/platform-freebsd.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 171 matching lines @@
 
 void OS::Abort() {
   // Redirect to std abort to signal abnormal program termination.
   abort();
 }
 
 
 void OS::DebugBreak() {
 #if (defined(__arm__) || defined(__thumb__))
   asm("bkpt 0");
+#elif defined(__aarch64__)
+  asm("brk 0");
 #else
   asm("int $3");
 #endif
 }
 
 
 void OS::DumpBacktrace() {
   POSIXBacktraceHelper<backtrace, backtrace_symbols>::DumpBacktrace();
 }
 
@@ skipping 390 matching lines @@
   limit_mutex = CreateMutex();
 }
 
 
 void OS::TearDown() {
   delete limit_mutex;
 }
 
 
 } }  // namespace v8::internal