[clang] [llvm] [NFC] Address bit-field storage sizes to ensure ideal packing (PR #139825)

[Oliver Hunt via cfe-commits]

ojhunt wrote:

> LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-win-fast` running on `as-builder-3` while building `clang,llvm` at step 6 "build-unified-tree".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/2/builds/24094
> 
> Here is the relevant piece of the build log for the reference

sigh, fixed with https://github.com/llvm/llvm-project/pull/140214/files

https://github.com/llvm/llvm-project/pull/139825