[clang-tools-extra] [clang-tidy] Avoid overflow when dumping unsigned integer values (PR #85060)

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ealcdan wrote:

Thanks for the review. I'm adding a test that checks that no '-1' is returned for misc-throw-by-value-catch-by-reference.MaxSize, that should pass even when no value is dumped for the option by default. I also added a test that sets 2⁶⁰ as a value for that option, and checks that the dumped value is 2⁶⁰ too.

https://github.com/llvm/llvm-project/pull/85060