Readd support for late loading of TClass in IsAProxy.
Readd support for late loading of TClass in IsAProxy.

When the cached value is nullptr, we need to check if the TClass has been loaded since.

omazapa/root-old,jrtomps/root,perovic/root,vukasinmilosevic/root,zzxuanyuan/root,pspe/root,mattkretz/root,dfunke/root,sbinet/cxx-root,esakellari/my_root_for_test,veprbl/root,abhinavmoudgil95/root,zzxuanyuan/root-compressor-dummy,buuck/root,omazapa/root-old,agarciamontoro/root,gganis/root,georgtroska/root,georgtroska/root,gbitzes/root,georgtroska/root,omazapa/root,arch1tect0r/root,omazapa/root-old,pspe/root,abhinavmoudgil95/root,omazapa/root,mattkretz/root,karies/root,simonpf/root,agarciamontoro/root,agarciamontoro/root,jrtomps/root,abhinavmoudgil95/root,abhinavmoudgil95/root,zzxuanyuan/root,zzxuanyuan/root,dfunke/root,abhinavmoudgil95/root,perovic/root,mhuwiler/rootauto,beniz/root,buuck/root,olifre/root,nilqed/root,olifre/root,evgeny-boger/root,dfunke/root,omazapa/root-old,BerserkerTroll/root,bbockelm/root,mattkretz/root,mhuwiler/rootauto,simonpf/root,perovic/root,evgeny-boger/root,lgiommi/root,esakellari/root,arch1tect0r/root,arch1tect0r/root,buuck/root,krafczyk/root,Duraznos/root,bbockelm/root,sirinath/root,mattkretz/root,esakellari/my_root_for_test,CristinaCristescu/root,sbinet/cxx-root,satyarth934/root,lgiommi/root,olifre/root,zzxuanyuan/root,buuck/root,CristinaCristescu/root,simonpf/root,mattkretz/root,lgiommi/root,davidlt/root,Y--/root,davidlt/root,buuck/root,esakellari/my_root_for_test,Duraznos/root,esakellari/my_root_for_test,veprbl/root,esakellari/my_root_for_test,omazapa/root-old,krafczyk/root,gganis/root,omazapa/root-old,thomaskeck/root,satyarth934/root,Y--/root,sawenzel/root,sirinath/root,Duraznos/root,zzxuanyuan/root,bbockelm/root,mattkretz/root,abhinavmoudgil95/root,evgeny-boger/root,dfunke/root,gganis/root,esakellari/root,mhuwiler/rootauto,root-mirror/root,georgtroska/root,beniz/root,CristinaCristescu/root,zzxuanyuan/root-compressor-dummy,jrtomps/root,esakellari/my_root_for_test,dfunke/root,gbitzes/root,vukasinmilosevic/root,esakellari/my_root_for_test,jrtomps/root,karies/root,agarciamontoro/root,BerserkerTroll/root,vukasinmilosevic/root,davidlt/root,krafczyk/root,Y--/root,zzxuanyuan/root-compressor-dummy,nilqed/root,satyarth934/root,veprbl/root,mhuwiler/rootauto,zzxuanyuan/root,esakellari/root,davidlt/root,buuck/root,satyarth934/root,gbitzes/root,veprbl/root,karies/root,Duraznos/root,BerserkerTroll/root,sbinet/cxx-root,mkret2/root,omazapa/root-old,zzxuanyuan/root,omazapa/root-old,mkret2/root,CristinaCristescu/root,CristinaCristescu/root,davidlt/root,mkret2/root,buuck/root,bbockelm/root,omazapa/root,olifre/root,omazapa/root,root-mirror/root,jrtomps/root,thomaskeck/root,simonpf/root,mkret2/root,georgtroska/root,mkret2/root,krafczyk/root,BerserkerTroll/root,omazapa/root,agarciamontoro/root,arch1tect0r/root,perovic/root,agarciamontoro/root,sawenzel/root,Duraznos/root,sbinet/cxx-root,karies/root,dfunke/root,buuck/root,krafczyk/root,pspe/root,evgeny-boger/root,vukasinmilosevic/root,davidlt/root,dfunke/root,CristinaCristescu/root,abhinavmoudgil95/root,thomaskeck/root,Y--/root,gganis/root,omazapa/root-old,agarciamontoro/root,bbockelm/root,veprbl/root,thomaskeck/root,satyarth934/root,Y--/root,agarciamontoro/root,gbitzes/root,mkret2/root,agarciamontoro/root,mattkretz/root,davidlt/root,omazapa/root,mkret2/root,sawenzel/root,simonpf/root,vukasinmilosevic/root,esakellari/root,gganis/root,sirinath/root,esakellari/root,vukasinmilosevic/root,perovic/root,gganis/root,mhuwiler/rootauto,thomaskeck/root,sbinet/cxx-root,omazapa/root,esakellari/root,perovic/root,lgiommi/root,veprbl/root,krafczyk/root,karies/root,pspe/root,sirinath/root,esakellari/root,karies/root,thomaskeck/root,sirinath/root,evgeny-boger/root,mhuwiler/rootauto,olifre/root,bbockelm/root,vukasinmilosevic/root,pspe/root,root-mirror/root,nilqed/root,jrtomps/root,nilqed/root,mhuwiler/rootauto,esakellari/root,evgeny-boger/root,BerserkerTroll/root,omazapa/root,pspe/root,veprbl/root,evgeny-boger/root,gbitzes/root,esakellari/my_root_for_test,beniz/root,jrtomps/root,beniz/root,sbinet/cxx-root,satyarth934/root,Y--/root,davidlt/root,zzxuanyuan/root,krafczyk/root,nilqed/root,CristinaCristescu/root,sawenzel/root,veprbl/root,esakellari/root,mattkretz/root,BerserkerTroll/root,georgtroska/root,bbockelm/root,veprbl/root,BerserkerTroll/root,jrtomps/root,sirinath/root,georgtroska/root,Y--/root,mkret2/root,veprbl/root,arch1tect0r/root,mhuwiler/rootauto,omazapa/root-old,Duraznos/root,omazapa/root,pspe/root,simonpf/root,esakellari/my_root_for_test,satyarth934/root,gbitzes/root,omazapa/root-old,krafczyk/root,zzxuanyuan/root,mhuwiler/rootauto,omazapa/root,zzxuanyuan/root-compressor-dummy,Duraznos/root,BerserkerTroll/root,perovic/root,georgtroska/root,simonpf/root,sbinet/cxx-root,thomaskeck/root,esakellari/root,lgiommi/root,root-mirror/root,Y--/root,abhinavmoudgil95/root,arch1tect0r/root,CristinaCristescu/root,mattkretz/root,pspe/root,jrtomps/root,gganis/root,vukasinmilosevic/root,evgeny-boger/root,root-mirror/root,beniz/root,zzxuanyuan/root-compressor-dummy,lgiommi/root,mkret2/root,georgtroska/root,root-mirror/root,olifre/root,beniz/root,krafczyk/root,sawenzel/root,beniz/root,evgeny-boger/root,BerserkerTroll/root,abhinavmoudgil95/root,olifre/root,veprbl/root,lgiommi/root,olifre/root,root-mirror/root,zzxuanyuan/root,root-mirror/root,sawenzel/root,simonpf/root,mattkretz/root,zzxuanyuan/root-compressor-dummy,sbinet/cxx-root,dfunke/root,davidlt/root,davidlt/root,olifre/root,perovic/root,root-mirror/root,gganis/root,buuck/root,dfunke/root,thomaskeck/root,karies/root,mkret2/root,bbockelm/root,lgiommi/root,zzxuanyuan/root-compressor-dummy,sawenzel/root,satyarth934/root,sawenzel/root,gbitzes/root,sawenzel/root,jrtomps/root,nilqed/root,simonpf/root,sbinet/cxx-root,jrtomps/root,gganis/root,olifre/root,dfunke/root,beniz/root,vukasinmilosevic/root,pspe/root,Duraznos/root,zzxuanyuan/root,pspe/root,abhinavmoudgil95/root,nilqed/root,nilqed/root,thomaskeck/root,abhinavmoudgil95/root,arch1tect0r/root,sirinath/root,zzxuanyuan/root-compressor-dummy,sbinet/cxx-root,sawenzel/root,karies/root,arch1tect0r/root,beniz/root,esakellari/my_root_for_test,perovic/root,gganis/root,Y--/root,sirinath/root,bbockelm/root,vukasinmilosevic/root,buuck/root,BerserkerTroll/root,karies/root,CristinaCristescu/root,CristinaCristescu/root,simonpf/root,satyarth934/root,Y--/root,zzxuanyuan/root-compressor-dummy,sirinath/root,mhuwiler/rootauto,omazapa/root,bbockelm/root,arch1tect0r/root,evgeny-boger/root,krafczyk/root,Duraznos/root,bbockelm/root,sirinath/root,mhuwiler/rootauto,olifre/root,satyarth934/root,sirinath/root,karies/root,perovic/root,sbinet/cxx-root,karies/root,zzxuanyuan/root,thomaskeck/root,nilqed/root,davidlt/root,root-mirror/root,georgtroska/root,perovic/root,zzxuanyuan/root-compressor-dummy,vukasinmilosevic/root,dfunke/root,Duraznos/root,Y--/root,agarciamontoro/root,lgiommi/root,nilqed/root,BerserkerTroll/root,arch1tect0r/root,Duraznos/root,lgiommi/root,satyarth934/root,gbitzes/root,simonpf/root,sawenzel/root,gganis/root,zzxuanyuan/root-compressor-dummy,mkret2/root,mattkretz/root,root-mirror/root,beniz/root,gbitzes/root,lgiommi/root,georgtroska/root,agarciamontoro/root,CristinaCristescu/root,pspe/root,arch1tect0r/root,buuck/root,gbitzes/root,krafczyk/root,evgeny-boger/root,esakellari/root,nilqed/root,beniz/root,gbitzes/root