Add LargeFileHelper::__construct() verifying that our assumptions hold.
Add LargeFileHelper::__construct() verifying that our assumptions hold.

bluelml/core,pixelipo/server,jbicha/server,pollopolea/core,andreas-p/nextcloud-server,nextcloud/server,pmattern/server,endsguy/server,Ardinis/server,Ardinis/server,endsguy/server,jbicha/server,sharidas/core,whitekiba/server,cernbox/core,lrytz/core,pixelipo/server,IljaN/core,andreas-p/nextcloud-server,sharidas/core,xx621998xx/server,michaelletzgus/nextcloud-server,cernbox/core,IljaN/core,bluelml/core,owncloud/core,sharidas/core,bluelml/core,sharidas/core,Ardinis/server,whitekiba/server,nextcloud/server,Ardinis/server,pmattern/server,xx621998xx/server,cernbox/core,whitekiba/server,pixelipo/server,cernbox/core,Ardinis/server,pollopolea/core,jbicha/server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,lrytz/core,IljaN/core,IljaN/core,owncloud/core,pollopolea/core,nextcloud/server,sharidas/core,lrytz/core,pollopolea/core,IljaN/core,phil-davis/core,pixelipo/server,bluelml/core,pmattern/server,pmattern/server,pmattern/server,owncloud/core,nextcloud/server,cernbox/core,michaelletzgus/nextcloud-server,owncloud/core,andreas-p/nextcloud-server,endsguy/server,bluelml/core,endsguy/server,jbicha/server,michaelletzgus/nextcloud-server,lrytz/core,owncloud/core,jbicha/server,lrytz/core,pollopolea/core,xx621998xx/server,pixelipo/server,whitekiba/server,endsguy/server,andreas-p/nextcloud-server,xx621998xx/server,xx621998xx/server,whitekiba/server