ART: Enable Clang's -Wdeprecated

Replace throw() with noexcept.

Add default copy constructors and copy assignment constructors for
cases with destructors, as the implicit definition is deprecated.

Change-Id: Ice306a3f510b072b00bec4d4360f7c8055135c9d
diff --git a/runtime/gc_root.h b/runtime/gc_root.h
index 4164bbd..2f4da3f 100644
--- a/runtime/gc_root.h
+++ b/runtime/gc_root.h
@@ -54,6 +54,7 @@
   explicit RootInfo(RootType type, uint32_t thread_id = 0)
      : type_(type), thread_id_(thread_id) {
   }
+  RootInfo(const RootInfo&) = default;
   virtual ~RootInfo() {
   }
   RootType GetType() const {