[lld] [lld-macho] Use larger ordinal encoding if import count requires it (PR #98305)

[Daniel Bertalan via llvm-commits]

BertalanD wrote:

>  Should we add things like assert(libOrdinal <= 255) to writeImport() (and similar for nameOffset, for all 3 struct types)? (Not necessarily in this PR)


Sure, I can add those. I'll submit it as a separate PR tomorrow as I'm not on my main dev machine right now.

https://github.com/llvm/llvm-project/pull/98305