Mirrors memory usage tweaks.

runtime/lib/mirrors.h

Index: runtime/lib/mirrors.h
diff --git a/runtime/lib/mirrors.h b/runtime/lib/mirrors.h
index 90fcdc61f5e681f75a01af3d63d21574b4a682d4..dc09109212e4c98ef8bb7fcfcc29c730edd6da2a 100644
--- a/runtime/lib/mirrors.h
+++ b/runtime/lib/mirrors.h
@@ -5,8 +5,30 @@
 #ifndef LIB_MIRRORS_H_
 #define LIB_MIRRORS_H_
 
+#include "vm/allocation.h"
+
 namespace dart {
 
+class Mirrors : public AllStatic {
+ public:
+  #define MIRRORS_KIND_SHIFT_LIST(V)                                           \
+    V(kAbstract)                                                               \
+    V(kGetter)                                                                 \
+    V(kSetter)                                                                 \
+    V(kConstructor)                                                            \
+    V(kConstCtor)                                                              \
+    V(kGenerativeCtor)                                                         \
+    V(kRedirectingCtor)                                                        \
+    V(kFactoryCtor)                                                            \
+
+  // These offsets much be kept in sync with those in mirrors_impl.dart.
+  enum KindShifts {
+  #define DEFINE_KIND_SHIFT_ENUM(name) name,
+  MIRRORS_KIND_SHIFT_LIST(DEFINE_KIND_SHIFT_ENUM)
+  #undef DEFINE_KIND_SHIFT_ENUM
+  };
+};
+
 }  // namespace dart
 
 #endif  // LIB_MIRRORS_H_