[clang] [llvm] [NFC][analyzer] Extract bounds checking library (PR #202372)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

@steakhal Another gentle ping.

I know that you have many other responsibilities, this is a big commit and you are continuously providing valuable review on the `NodeBuilder` removal changes that I'm spamming out :sweat_smile: but I would be grateful if you could review this one.

I'll probably continue to produce `NodeBuilder` removal changes, but please don't spend time on reviewing those before tackling this – I can arrange other reviewers for those, but your expertise would be valuable here.

https://github.com/llvm/llvm-project/pull/202372