Compute alloc size similarly for hinted patterns.
Compute alloc size similarly for hinted patterns.

This makes sizes look more identical.  The alternative would be better
numeric normalisation.

HIPERFIT/futhark,HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark