[clang] [lldb] [clang][AST] Added assert to prevent infinite recursion in computing layout (PR #154123)

[Michael Buch via cfe-commits]

Michael137 wrote:

Also, please split out the clang change into a separate PR. The clang maintainers can comment on whether that's a useful thing to have in place

https://github.com/llvm/llvm-project/pull/154123