[clang] [llvm] [Clang] Fix definition of layout-compatible to ignore empty classes (PR #92103)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Ah, OK - guess this might not be an ABI issue, then - carry on :) (I'll leave it to other Clang-y folks to do the rest of the review, the ABI issues were my only concern)

https://github.com/llvm/llvm-project/pull/92103