cfg: fix stack depth of TryBegin when splitting across blocks.

Author: arusuki

src/bytecode/cfg.py

@@ -871,9 +871,7 @@ def from_bytecode(bytecode: _bytecode.Bytecode) -> "ControlFlowGraph":
                     #   the new one since the blocks are disconnected.
                     if last_instr.is_final() and temp:
                         old_block.append(TryEnd(try_begins[active_try_begin][-1]))
-                        new_tb = TryBegin(
-                            active_try_begin.target, active_try_begin.push_lasti
-                        )
+                        new_tb = active_try_begin.copy()
                         block.append(new_tb)
                         # Add this new TryBegin to the map to properly update
                         # the target.