[clang] [CIR] Fix unary op folding (PR #132269)

[Erich Keane via cfe-commits]

https://github.com/erichkeane approved this pull request.

I don't have a problem wtih this, but one of the other reviewers/CIR folks ought to doublecheck.

https://github.com/llvm/llvm-project/pull/132269