[clang] [clang][AST] Added assert to prevent infinite recursion in computing layout (PR #154134)

[Michael Buch via cfe-commits]

Michael137 wrote:

I think @AaronBallman is currently OOO until the end of the month. I'll go ahead and LGTM it, but please give @cor3ntin (or another maintainer) some time to interject.

https://github.com/llvm/llvm-project/pull/154134