[turbofan] Optimize stores to global properties.

src/compiler/js-global-specialization.h

Index: src/compiler/js-global-specialization.h
diff --git a/src/compiler/js-global-specialization.h b/src/compiler/js-global-specialization.h
index 98473a8017faff76030f186bb8f2b6a5e63ce87c..d6de4e119809cdbaab8cec80a8f50fbaff5c7938 100644
--- a/src/compiler/js-global-specialization.h
+++ b/src/compiler/js-global-specialization.h
@@ -19,6 +19,7 @@ class CompilationDependencies;
 namespace compiler {
 
 // Forward declarations.
+class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
 
@@ -60,6 +61,7 @@ class JSGlobalSpecialization final : public AdvancedReducer {
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
+  CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() { return &simplified_; }
   Flags flags() const { return flags_; }