[ic] [stubs] Add missing GetExtraICState method to CompareICStub.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 19c40f4e8bd8412533144557f1e3480b0e37273f..1e2e85425228ab05c59364f15c66fa23f922cb66 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -1972,6 +1972,10 @@ class CompareICStub : public PlatformCodeStub {
     minor_key_ = extra_ic_state;
   }
 
+  ExtraICState GetExtraICState() const final {
+    return static_cast<ExtraICState>(minor_key_);
+  }
+
   void set_known_map(Handle<Map> map) { known_map_ = map; }
 
   InlineCacheState GetICState() const;