Some bugfixes

• Fix bug in creating zero constants in the editor
• Don't make plans by default to avoid running into issues with repair_plan (all this code is going to get ripped out anyway so this is fine)
• Fix for intra-SROA
• Some more GVN & DCE in default pass order to make cava less inscrutable

hercules_opt/src/editor.rs

@@ -462,7 +462,7 @@ impl<'a, 'b> FunctionEdit<'a, 'b> {
                 Constant::Product(id, dummy_elems.into_boxed_slice())
             }
             Type::Summation(tys) => Constant::Summation(id, 0, self.add_zero_constant(tys[0])),
-            Type::Array(tid, _) => Constant::Array(tid),
+            Type::Array(_, _) => Constant::Array(id),
         };
         self.add_constant(constant_to_construct)
     }