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

[Zequan Wu via llvm-commits]

ZequanWu wrote:

> I also would suggest a smaller default value.
What's your suggestion for the cutoff? This warning emits at the time when reading counter value from raw profiles, which happens before scaling and merging.

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