Remove an erroneous assert #9199

Job	Run time
make (check, --enable-yjit=dev)	14m 18s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-14 --enable-yjit=dev --enable-zji...	4m 41s
cargo test	1m 4s
cargo clippy	50s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	9m 35s
make (test-bundled-gems, --enable-yjit=dev)	24m 51s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	15m 51s
YJIT Ubuntu result	4s
	1h 11m 14s

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