[clang] [Clang] Sequence the object argument of an overloaded operator[] or operator() first (PR #215479)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Maybe it's checking for trivial in some other sense.  See MicrosoftCXXABI::classifyReturnType .

32-bit x86 ABI is weird for other reasons, don't wouldn't worry about it too much.

https://github.com/llvm/llvm-project/pull/215479