[llvm] [APInt] Assert correct values in APInt constructor (PR #80309)

[Nikita Popov via llvm-commits]

nikic wrote:

As a side note, it seems like not having the implicit truncation also improves compile-time: http://llvm-compile-time-tracker.com/compare.php?from=fd191378dce6b20c100da716f94130af2593df37&to=df515f3e94d5f5d10ecddfb60181d8866817cc27&stat=instructions:u

https://github.com/llvm/llvm-project/pull/80309