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

[via llvm-commits]

zmodem wrote:

It seems the current version doesn't error out, but just emits a warning. I thought what we want is to make this a hard error by default, with a flag that makes it possible to treat it as a warning instead.

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