fix(gen): 补回 CallGenMixin 的 _FreedMark（修行尾时被 checkout 回滚）

TPC 报 MemberLookupFailFast: 属性 Freed 在 VarEntry 中找不到 —— 该文件的行尾修复用 git checkout 恢复过，把未提交的 _FreedMark 改动一并回滚了，残留 ent_wf.Freed = 1。

App/lib/core/Gen/Call/CallGenMixin.vp

@@ -972,8 +972,7 @@ novirtual class CallGenMixin(CallGenBase.CallGenBase):
                 if arg_wf is None or arg_wf.kind() != ast.ASTKind.Name: continue
                 nm_wf: ast.Name* = ast.Name*(arg_wf)
                 if nm_wf.id is None: continue
-                ent_wf: GenTypes.VarEntry* = self.Gen.VarGen.lookup_var_entry(trans.SymTab, nm_wf.id)
-                if ent_wf is not None: ent_wf.Freed = 1
+                self.Gen.VarGen._FreedMark(self.Gen.VarGen.lookup_var(trans.SymTab, nm_wf.id))
         # Default-argument filling: when fewer args than params, fill the gaps; the defaults array is
         # right-aligned to args (defaults[0] maps to args[offset], offset = param_count - default_count).
         if can > 0 or (can == 0 and cargs is not None):