[clang] [CIR][NFC] Replace bool by cir::UnaryOpKind in emitComplexPrePostIncDec (PR #149566)

[Andy Kaylor via cfe-commits]

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

LGTM

We should make this same change in `ScalarExprEmitter::EmitScalarPrePostIncDec`

https://github.com/llvm/llvm-project/pull/149566