Reduce meta-data object sizes, introduce meta-data helper classes.

Change-Id: Id14ad218f1c74c659701352fdf1a45bf6444daa3
diff --git a/src/utils.h b/src/utils.h
index f5e0c49..5b3a036 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -159,6 +159,7 @@
 std::string PrettyDescriptor(const String* descriptor);
 std::string PrettyDescriptor(const std::string& descriptor);
 std::string PrettyDescriptor(Primitive::Type type);
+std::string PrettyDescriptor(const Class* klass);
 
 // Returns a human-readable signature for 'f'. Something like "a.b.C.f" or
 // "int a.b.C.f" (depending on the value of 'with_type').