[compiler] Generalize JSContextSpecialization.

src/compiler/js-context-specialization.h

Index: src/compiler/js-context-specialization.h
diff --git a/src/compiler/js-context-specialization.h b/src/compiler/js-context-specialization.h
index ef784fc442812ca1c9a7cac1622a4c194a389786..7d624f1dc9aa19640e6d2c988aeee1fc4963e5a0 100644
--- a/src/compiler/js-context-specialization.h
+++ b/src/compiler/js-context-specialization.h
@@ -30,8 +30,10 @@ class JSContextSpecialization final : public AdvancedReducer {
   Reduction ReduceJSLoadContext(Node* node);
   Reduction ReduceJSStoreContext(Node* node);
 
-  // Returns the {Context} to specialize {node} to (if any).
-  MaybeHandle<Context> GetSpecializationContext(Node* node);
+  Reduction StrengthenJSStoreContext(Node* node, Node* new_context,
+                                     size_t new_depth);
+  Reduction StrengthenJSLoadContext(Node* node, Node* new_context,
+                                    size_t new_depth);
 
   Isolate* isolate() const;
   JSOperatorBuilder* javascript() const;