[clang] [clang][dataflow] fix assert in `Environment::getResultObjectLocation` (PR #79608)

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https://github.com/martinboehme requested changes to this pull request.

Thanks for catching this!

Can you add a test that fails without the fix? See the existing test `ResultObjectLocation` in TransferTest.cpp -- you should be able to create a new test based on this that has a `CXXOperatorCallExpr` returning a record by value.

https://github.com/llvm/llvm-project/pull/79608