compiler: Enhance ClusterGroup

Author: FabioLuporini

devito/ir/clusters/cluster.py

@@ -655,6 +655,12 @@ def __hash__(self):
     def concatenate(cls, *cgroups):
         return list(chain(*cgroups))
 
+    def rebuild(self, **kwargs):
+        clusters = kwargs.get('clusters', self)
+        ispace = kwargs.get('ispace', self.ispace)
+
+        return self.__class__(clusters, ispace=ispace)
+
     @cached_property
     def exprs(self):
         return flatten(c.exprs for c in self)
@@ -663,6 +669,10 @@ def exprs(self):
     def scope(self):
         return Scope(exprs=self.exprs)
 
+    @cached_property
+    def functions(self):
+        return self.scope.functions
+
     @cached_property
     def ispace(self):
         return self._ispace