[clang] [NFC][analyzer] OOB test consolidation III: 'outofbound' tests (PR #128508)

[Donát Nagy via cfe-commits]

NagyDonat wrote:

I think the "why were these testcases redundant?" information is too verbose for a commit message; moreover it only conveys information about code that was _removed_ from the repository, so it won't be relevant for readers in the future who are presumably only interested in code that _stays_ in the repository.

https://github.com/llvm/llvm-project/pull/128508