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

[Richard Smith via cfe-commits]

zygoloid wrote:

> > > #112806 should address this without narrowing the field to 32 bits.
> > 
> > 
> > As does [#111995 (comment)](https://github.com/llvm/llvm-project/pull/111995#discussion_r1805329590), with less code and more generality
> 
> I prefer this solution too.

That solution still violates the rules of the C++ object model.

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