ART: Fix "unused parameters"

GCC 4.8 decides that parameters for functions implemented with
"= default" are unused. This currently only impacts x86, but remove
the parameter names anyways.

Change-Id: I01865faa81af68c4c0e0b1cb1fb19e88ef548769
diff --git a/cmdline/cmdline_result.h b/cmdline/cmdline_result.h
index bf3a85d..963dfc1 100644
--- a/cmdline/cmdline_result.h
+++ b/cmdline/cmdline_result.h
@@ -65,9 +65,9 @@
     }
 
     // Make sure copying exists
-    CmdlineResult(const CmdlineResult& other) = default;
+    CmdlineResult(const CmdlineResult&) = default;
     // Make sure moving is cheap
-    CmdlineResult(CmdlineResult&& other) = default;
+    CmdlineResult(CmdlineResult&&) = default;
 
   private:
     const Status status_;