Add mips64 support to app_process.

Change-Id: Ieb05a212606f02ebad119a0aea0ed92773ace214
diff --git a/cmds/app_process/app_main.cpp b/cmds/app_process/app_main.cpp
index fbdbb25..c86fd53 100644
--- a/cmds/app_process/app_main.cpp
+++ b/cmds/app_process/app_main.cpp
@@ -146,8 +146,10 @@
     static const char kInstructionSet[] = "arm";
 #elif defined(__i386__)
     static const char kInstructionSet[] = "x86";
-#elif defined (__mips__)
+#elif defined (__mips__) && !defined(__LP64__)
     static const char kInstructionSet[] = "mips";
+#elif defined (__mips__) && defined(__LP64__)
+    static const char kInstructionSet[] = "mips64";
 #else
 #error "Unknown instruction set"
 #endif