Mark HCompareMap as having Tagged representation

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 0a92a9f4234b2a87e612c6fbd0cfcd4a787f3c97..baf64fcc32bb7ac7bbc6ffb44b03340add985fee 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1617,6 +1617,7 @@ class HCompareMap V8_FINAL : public HUnaryControlInstruction {
       map->AddDependentCompilationInfo(
           DependentCode::kPrototypeCheckGroup, info);
     }
+    set_representation(Representation::Tagged());
   }
 
   int known_successor_index_;