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

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

I think the next steps for this are: 1) bring up to date with ToT and ensure existing all tests pass, 2) add additional test coverage showing the behavioral change, possibly with FIXME comments in cases where we think the behavior could be better, 3) add a release note.

>From there, we can see if we're happy with the state of things or whether further changes are needed.

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