[turbofan] Fix missing operators for JSGlobalSpecialization::Flags.

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 cf9f1cc0de53cdb3fb9e64f40656e041d8230f23..98473a8017faff76030f186bb8f2b6a5e63ce87c 100644
--- a/src/compiler/js-global-specialization.h
+++ b/src/compiler/js-global-specialization.h
@@ -75,6 +75,8 @@ class JSGlobalSpecialization final : public AdvancedReducer {
   DISALLOW_COPY_AND_ASSIGN(JSGlobalSpecialization);
 };
 
+DEFINE_OPERATORS_FOR_FLAGS(JSGlobalSpecialization::Flags)
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8