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

[Xavier Roche via cfe-commits]

xroche wrote:

@efriedma-quic This [MSVC example](https://godbolt.org/z/ePWvPhE7c) has a right-to-left case where `canPassInRegisters()` is true and a left-to-right case where it is false. The check cannot predict MSVC's order, so I would keep the current left-to-right behavior :shrug: 

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