[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 64931e1a0105774566749e0506e192ba2af25715..d67f62dc3d63969d0e9be4db7bf7d80c4b018446 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);