More optimizations

• A lot of misc. optimization work, notably parallelization of Rodinia CPU schedules.
• Support >32 tiles in GPU backend.
• Tweak some transformations.

juno_samples/rodinia/bfs/src/cpu.sch

@@ -48,10 +48,8 @@ let traverse_body = outline(inner);
 let (outer, inner) = fork-reshape[[1], [0]](collect);
 let collect_body = outline(inner);
 
-inline(bfs);
-delete-uncalled(*);
 const-inline(*);
 simpl!(*);
 
 unforkify(init_body, traverse_body, collect_body);
-gcm(*);
+gcm(*);
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