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_types.h b/cmdline/cmdline_types.h
index 180baec..2667121 100644
--- a/cmdline/cmdline_types.h
+++ b/cmdline/cmdline_types.h
@@ -337,8 +337,8 @@
 
   // Default constructors/copy-constructors.
   MillisecondsToNanoseconds() : nanoseconds_(0ul) {}
-  MillisecondsToNanoseconds(const MillisecondsToNanoseconds& rhs) = default;
-  MillisecondsToNanoseconds(MillisecondsToNanoseconds&& rhs) = default;
+  MillisecondsToNanoseconds(const MillisecondsToNanoseconds&) = default;
+  MillisecondsToNanoseconds(MillisecondsToNanoseconds&&) = default;
 
  private:
   uint64_t nanoseconds_;
@@ -421,8 +421,8 @@
   }
 
   ParseStringList() = default;
-  ParseStringList(const ParseStringList& rhs) = default;
-  ParseStringList(ParseStringList&& rhs) = default;
+  ParseStringList(const ParseStringList&) = default;
+  ParseStringList(ParseStringList&&) = default;
 
  private:
   std::vector<std::string> list_;
@@ -651,8 +651,8 @@
     max_stack_depth_(0) {
   }
 
-  TestProfilerOptions(const TestProfilerOptions& other) = default;
-  TestProfilerOptions(TestProfilerOptions&& other) = default;
+  TestProfilerOptions(const TestProfilerOptions&) = default;
+  TestProfilerOptions(TestProfilerOptions&&) = default;
 };
 
 static inline std::ostream& operator<<(std::ostream& stream, const TestProfilerOptions& options) {