[clang] [Clang] Fix CXXRewrittenBinaryOperator::getDecomposedForm to handle case when spaceship operator returns comparison category by reference (PR #66270)

[Shafik Yaghmour via cfe-commits]

shafik wrote:

> Perhaps it needs a release note?

You would think I would remember this by now.

https://github.com/llvm/llvm-project/pull/66270