Add mising methods for ExplicitMemory lore.
Add mising methods for ExplicitMemory lore.

ihc/futhark,CulpaBS/wbBach,diku-dk/futhark,mrakgr/futhark,diku-dk/futhark,mrakgr/futhark,HIPERFIT/futhark,diku-dk/futhark,mrakgr/futhark,ihc/futhark,diku-dk/futhark,ihc/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark