[clang] [Clang] Add thousands-separator to "cannot allocate array; evaluated array bound [...] exceeds the limit" diagnostic (PR #211785)

[Ambrose Leeb via cfe-commits]

https://github.com/Sirraide requested changes to this pull request.

There are a lot of calls to `formatDiagnosticInteger()` that should be removed

https://github.com/llvm/llvm-project/pull/211785