Revert "[cxxmodules] Prepone callback initialization in cling."
Revert "[cxxmodules] Prepone callback initialization in cling."

This reverts commit 62fc3e9eddc6c7e78c3becf60092143607cddf50.

root-mirror/root,karies/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,karies/root,karies/root,karies/root,olifre/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root