Revert of Always deserialize scope infos for parsing

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index 561a7fce06f8fcf32715040f605681bfd47d3f4b..8a84664c18ec44d657ebc85db9208c98d3b66c5f 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -124,8 +124,12 @@
 
   // Lookup a variable in this scope. Returns the variable or NULL if not found.
   Variable* LookupLocal(const AstRawString* name) {
-    return variables_.Lookup(name);
-  }
+    Variable* result = variables_.Lookup(name);
+    if (result != nullptr || scope_info_.is_null()) return result;
+    return LookupInScopeInfo(name);
+  }
+
+  Variable* LookupInScopeInfo(const AstRawString* name);
 
   // Lookup a variable in this scope or outer scopes.
   // Returns the variable or NULL if not found.