ZJIT: Simplify usage of prepare_direct_send_args #12510

Job	Run time
Windows 2025/Visual C++ 2022 (test-bundled-gems)	26m 41s
Windows 2022/Visual C++ 2022 (check)	24m 57s
Windows 2025/Visual C++ 2022 (check)	29m 1s
Windows 11-arm/Visual C++ (btest test-basic test-tool)	18m 32s
Windows result	3s
	1h 39m 14s

Provide feedback