define rb_current_ec_set in all cases #223

Job	Run time
cargo test	46s
make (check, --enable-yjit, --yjit)	8m 21s
make (check, --enable-yjit=dev, --yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc, -T --yj...	26m 11s
YJIT macOS Arm64 result	1s
	35m 19s

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