YJIT, ZJIT: enhance clippy settings and fix lint #90

Job	Run time
make (zjit-check, --enable-yjit=dev --enable-zjit)	3m 4s
make (zjit-test-all, --enable-zjit=dev, --seed=11831)	5m 41s
make (ruby, --enable-yjit --enable-zjit)	2m 57s
make (btest, --enable-zjit=dev)	3m 32s
ZJIT macOS Arm64 result	2s
	15m 16s

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