[turbofan] Optimized lowering of DYNAMIC_GLOBAL lookup slot loads.

src/compiler/js-typed-lowering.h

Index: src/compiler/js-typed-lowering.h
diff --git a/src/compiler/js-typed-lowering.h b/src/compiler/js-typed-lowering.h
index add45ce216a06da29f6419c04cfbe913d4c8e91b..fbd5c214223f86fcf3e5cded82ca3e822796909e 100644
--- a/src/compiler/js-typed-lowering.h
+++ b/src/compiler/js-typed-lowering.h
@@ -45,6 +45,7 @@ class JSTypedLowering final : public AdvancedReducer {
   Reduction ReduceJSStoreProperty(Node* node);
   Reduction ReduceJSLoadContext(Node* node);
   Reduction ReduceJSStoreContext(Node* node);
+  Reduction ReduceJSLoadDynamicGlobal(Node* node);
   Reduction ReduceJSEqual(Node* node, bool invert);
   Reduction ReduceJSStrictEqual(Node* node, bool invert);
   Reduction ReduceJSUnaryNot(Node* node);