Add test program for in place lowering.
Add test program for in place lowering.

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