Revert "[TCling] GetTopLevelMacroName; survive "no active macro" case; hide warning."
Revert "[TCling] GetTopLevelMacroName; survive "no active macro" case; hide warning."

This reverts commit ff71d75371bd584bf8632c97ce6adfe37834db01.

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