Add BCC support for rs_object_slots metadata.

This is added to support proper cleanup of RS resources. We were leaking some
global resources because there was no way to tell which slots to clear.

Change-Id: I3e01ff4f7105444b7610d514f10dd56cb1b359b8
b: 3381615
diff --git a/lib/bcc/CacheReader.h b/lib/bcc/CacheReader.h
index 3f052d0..e66503e 100644
--- a/lib/bcc/CacheReader.h
+++ b/lib/bcc/CacheReader.h
@@ -74,6 +74,7 @@
     bool readExportFuncList();
     bool readPragmaList();
     bool readFuncTable();
+    bool readObjectSlotList();
     bool readContext();
     bool readRelocationTable();