[turbofan] Fix non-termination in RedundancyElimination.

src/compiler/redundancy-elimination.h

Index: src/compiler/redundancy-elimination.h
diff --git a/src/compiler/redundancy-elimination.h b/src/compiler/redundancy-elimination.h
index a4886e4b919ec296186106a502828a4076fbb185..88f9032a84aa52e6c1662163e1cd2cfe400b342e 100644
--- a/src/compiler/redundancy-elimination.h
+++ b/src/compiler/redundancy-elimination.h
@@ -29,6 +29,7 @@ class RedundancyElimination final : public AdvancedReducer {
    public:
     static EffectPathChecks* Copy(Zone* zone, EffectPathChecks const* checks);
     static EffectPathChecks const* Empty(Zone* zone);
+    bool Equals(EffectPathChecks const* that) const;
     void Merge(EffectPathChecks const* that);
 
     EffectPathChecks const* AddCheck(Zone* zone, Node* node) const;