Inline transpose in CopyCtPropFold.
Inline transpose in CopyCtPropFold.

This is necessary for some fusion changes I'm making.

Also cleans it up slightly (but it's still a really messy module).

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