briefly defer yielding the thread/gvl #323

Job	Run time
make (check, --enable-yjit, --yjit)	2m 2s
cargo test	54s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	2m 4s
YJIT macOS result	4s
	5m 4s

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