[clang] [llvm] Replace cl::bits with cl::list. NFC (PR #226399)

[Fangrui Song via llvm-commits]

MaskRay wrote:

Dropping some cl:: features to enable migration to TableGen

https://discourse.llvm.org/t/rfc-declare-library-command-line-options-in-tablegen-one-struct-per-library/91877/13?u=maskray

https://github.com/llvm/llvm-project/pull/226399