[llvm-branch-commits] [clang] [llvm] release/19.x: [clang] Fix definition of layout-compatible to ignore empty classes (PR #101491)

[Aaron Ballman via llvm-branch-commits]

https://github.com/AaronBallman approved this pull request.

LGTM!

The ABI precommit CI test failures look to be unrelated to these changes, but at the same time, this could potentially impact ABI (any time we change the behavior of a type trait, it can potentially impact ABI). So it may be good to get a second set of eyes on those failures just to be sure they're not caused by this PR.

https://github.com/llvm/llvm-project/pull/101491