__arm64__ and __aarch64__ #ifdef adjustments

Change by Paul Osmialowski

See http://reviews.llvm.org/D4379 for details.

llvm-svn: 212583
diff --git a/lldb/tools/debugserver/source/DNBDefs.h b/lldb/tools/debugserver/source/DNBDefs.h
index ad87c0f..a8c5fd9 100644
--- a/lldb/tools/debugserver/source/DNBDefs.h
+++ b/lldb/tools/debugserver/source/DNBDefs.h
@@ -23,7 +23,7 @@
 //----------------------------------------------------------------------
 // Define nub_addr_t and the invalid address value from the architecture
 //----------------------------------------------------------------------
-#if defined (__x86_64__) || defined (__ppc64__) || defined (__arm64__)
+#if defined (__x86_64__) || defined (__ppc64__) || defined (__arm64__) || defined (__aarch64__)
 
 //----------------------------------------------------------------------
 // 64 bit address architectures