Add a few more array operations to the C code generator.  I need to abstract some of this out, however.
Add a few more array operations to the C code generator.  I need to
abstract some of this out, however.

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