[clang] [clang] Avoid printing overly large integer/_BitInt numbers in static assertion failure diagnostics #71675 (PR #145053)

[Timm Baeder via cfe-commits]

tbaederr wrote:

What are the times with the full `__BITINT_MAXWIDTH__` without the right-shift?

https://github.com/llvm/llvm-project/pull/145053