Add TODO checker to cg_clif #4369

Job	Run time
rustfmt	13s
test_llvm	27s
bench	5m 49s
todo_check	24s
dist (macos-15-intel, x86_64-apple-darwin)	3m 3s
dist (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	1m 44s
dist (windows-latest, x86_64-pc-windows-gnu)	3m 14s
test (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	42s
test (macos-15-intel, x86_64-apple-darwin)	1m 51s
test (macos-latest, aarch64-apple-darwin)	56s
test (windows-latest, x86_64-pc-windows-gnu)	23m 6s
dist (ubuntu-22.04, x86_64-unknown-linux-gnu)	1m 41s
test (windows-latest, x86_64-pc-windows-msvc)	1m 24s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	1m 53s
test (ubuntu-latest, riscv64gc-unknown-linux-gnu, gcc-riscv64-linux-gnu qemu-user)	53s
dist (windows-latest, x86_64-pc-windows-msvc)	2m 10s
dist (macos-latest, aarch64-apple-darwin)	1m 34s
test (ubuntu-latest, s390x-unknown-linux-gnu, gcc-s390x-linux-gnu qemu-user)	54s
release	0s
	51m 58s

Provide feedback