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

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

Please check what MSVC actually does here.  Some brief testing seems to show that it does straight left-to-right for array indexing, instead of the mixed ordering you've implemented.

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