[clang] [clang] LazyOffsetPtr: Use native pointer width (PR #111995)

[A. Wilcox via cfe-commits]

awilfox wrote:

I feel like the messages being highlighted in the CI formatter need work anyway.  I was hoping the community would have a suggestion on better wording.  However, I will be glad to reformat those lines in that manner if this wording should stay.

https://github.com/llvm/llvm-project/pull/111995