[clang] [Clang] Allow user defined conversion implicit cast to _Complex types in constant expressions (PR #108758)

[Shafik Yaghmour via cfe-commits]

https://github.com/shafik commented:

You need to add more details to the summary something like: the fix was to handle `CK_UserDefinedConversion` in `ComplexExprEvaluator::VisitCastExpr` as opposed to treating it as an error.


https://github.com/llvm/llvm-project/pull/108758