[parsing] Fix maybe-assigned for top-level class declarations.

src/parsing/pattern-rewriter.cc

Index: src/parsing/pattern-rewriter.cc
diff --git a/src/parsing/pattern-rewriter.cc b/src/parsing/pattern-rewriter.cc
index 2dad31d8d3a0d1723c392ae3083c746db62ca6ba..6d2ed3d8bb05af405030c8211b708fab7d52cc94 100644
--- a/src/parsing/pattern-rewriter.cc
+++ b/src/parsing/pattern-rewriter.cc
@@ -171,12 +171,10 @@ void Parser::PatternRewriter::VisitVariableProxy(VariableProxy* pattern) {
     names_->Add(name, zone());
   }
 
-  Scope* var_init_scope = descriptor_->scope;
-  MarkTopLevelVariableAsAssigned(var_init_scope, proxy);
-
   // If there's no initializer, we're done.
   if (value == nullptr) return;
 
+  Scope* var_init_scope = descriptor_->scope;
   MarkLoopVariableAsAssigned(var_init_scope, proxy->var());
 
   // A declaration of the form: