compiler: Add IterationSpace.concrete

Author: FabioLuporini

devito/ir/support/space.py

@@ -1056,6 +1056,10 @@ def outermost(self):
     def innermost(self):
         return self[-1]
 
+    @cached_property
+    def concrete(self):
+        return self.project(lambda d: not d.is_Virtual)
+
     @cached_property
     def itintervals(self):
         return tuple(self[d] for d in self.itdims)