[llvm] [llvm-profdata] Emit error when counter value is greater than 2^56. (PR #69513)

[Matthias Braun via llvm-commits]

https://github.com/MatzeB commented:

I think it would be good to have a flag to downgrade this to an error (should be an error/abort by default of course). For example I remember mixing instrumented object files from different major llvm versions can silently give you invalid data, so I fear there may be people out there processing invalid data today and it's nice to give them a way to keep their jobs/actions/workflows running with a temporary workaround...

https://github.com/llvm/llvm-project/pull/69513