VM: Add result cid information for recognized methods.

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
diff --git a/runtime/vm/intermediate_language.h b/runtime/vm/intermediate_language.h
index be04e5ee8a165bf3efe1b739be0077332a1df452..27fe9a107431eadbd9e0f6596ea51c2b08a787a1 100644
--- a/runtime/vm/intermediate_language.h
+++ b/runtime/vm/intermediate_language.h
@@ -2912,6 +2912,8 @@ class PolymorphicInstanceCallInstr : public TemplateDefinition<0, Throws> {
     return instance_call_->token_pos();
   }
 
+  virtual CompileType ComputeType() const;
+
   virtual intptr_t ArgumentCount() const {
     return instance_call()->ArgumentCount();
   }