fix corner case in inline & unused (#5725)

fixes #5724

lib/compress.js

@@ -364,7 +364,7 @@ Compressor.prototype.compress = function(node) {
                 expression: make_node(AST_Function, self, {
                     argnames: [],
                     body: self.body,
-                }).init_vars(self),
+                }).init_vars(self, self),
                 args: [],
             });
         }
@@ -8963,7 +8963,7 @@ Compressor.prototype.compress = function(node) {
                     argnames: [],
                     body: [],
                     value: make_value(),
-                }).init_vars(self.parent_scope),
+                }).init_vars(self.parent_scope, self),
                 args: [],
             }));
             return make_sequence(self, exprs);