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

[John Paul Adrian Glaubitz via cfe-commits]

glaubitz wrote:

> cc @glaubitz (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113341)

I can confirm that the patch from this PR fixes the GCC bootstrap on 32-bit PowerPC on Linux for me (GCC pr/target 113341).

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