AOT: Use a cid range check when possible to implement type tests.

runtime/vm/flow_graph_compiler.h

Index: runtime/vm/flow_graph_compiler.h
diff --git a/runtime/vm/flow_graph_compiler.h b/runtime/vm/flow_graph_compiler.h
index 7541f1bd6bd970d356f5f0ad38bc92df2fc2838e..d6c74cbcb80d2fe7313dce0dedc7209cbd216f0b 100644
--- a/runtime/vm/flow_graph_compiler.h
+++ b/runtime/vm/flow_graph_compiler.h
@@ -705,9 +705,6 @@ class FlowGraphCompiler : public ValueObject {
                                                    Label* is_instance_lbl,
                                                    Label* is_not_instance_lbl);
 
-  // Returns true if checking against this type is a direct class id comparison.
-  bool TypeCheckAsClassEquality(const AbstractType& type);
-
   void GenerateBoolToJump(Register bool_reg, Label* is_true, Label* is_false);
 
   void CopyParameters();