YJIT: Fix return type of Integer#/ with T_FIXNUM inputs #377

Job	Run time
Rust cargo test	53s
Rust lint	41s
make (yjit-bindgen, To fix: use patch in logs, --with-gcc=clang-12 --enable-yjit=dev)	6m 13s
make (check, RUSTC='rustc +1.58.0', 1.58.0)	19m 14s
make (check, --enable-yjit=dev)	32m 26s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx)	36m 52s
make (test-all TESTS=--repeat-count=2, --enable-yjit=dev)	46m 1s
make (test-bundled-gems, --enable-yjit=dev)	21m 34s
make (yjit-bench, --enable-yjit=dev, --yjit-stats)	7m 7s
	2h 51m 1s

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