Add dictionary for TBulkBranchRead.

The class is transient so the dictionary is not needed by itself.  However not having the
dictionary leads to a lookup for the class namespace 'ROOT::Experimental' and this leads to
loading of the 'first' library that has a dictionary for something in 'ROOT::Experimental'.
This is undesirable (i.e. load the Eve library for a simple TTree job), so we create the
dictionary for TBulkBranchRead.

Author: pcanal

tree/tree/inc/LinkDef.h

@@ -96,4 +96,5 @@
 #pragma link C++ class ROOT::Internal::TreeUtils::RNoCleanupNotifier;
 #pragma link C++ class TNotifyLink<ROOT::Internal::TreeUtils::RNoCleanupNotifierHelper>;
 
+#pragma link C++ class ROOT::Experimental::Internal::TBulkBranchRead+;
 #endif