[clang] [clang][CFG] Sequence RHS before LHS for overloaded assignment operators in CFG to match C++17 rules (PR #181113)

[Alex Wang via cfe-commits]

aeft wrote:

@usx95 Thanks for your review! I just updated it. Do I need to wait for approval from another reviewer, or can it be merged?

https://github.com/llvm/llvm-project/pull/181113