[llvm] [Profile] Add a more descriptive message to the bad_header error (PR #211281)

[Hubert Tong via llvm-commits]

hubert-reinterpretcast wrote:

> I intentionally ignored clang-format's suggestion as it was less readable

You can add comments into the source that act as clang-format directives to ignore a block.

https://github.com/llvm/llvm-project/pull/211281