add terminate to terminate chain. (#381)

fixes QuEraComputing/bloqade-circuit#172

Author: weinbe58

src/kirin/dialects/scf/unroll.py

@@ -88,4 +88,4 @@ def rewrite_Statement(self, node: ir.Statement) -> RewriteResult:
         for result, output in zip(node.results, loop_vars):
             result.replace_by(output)
         node.delete()
-        return RewriteResult(has_done_something=True)
+        return RewriteResult(has_done_something=True, terminated=True)