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

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

> Can we remove `getAddressOfPointer` instead?. Where is it being used?

It is used in `VarDecl::getInitAddress()` in Decl.cpp. It looks like it is used indirectly by the StmtIterator

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