[clang] [Clang] Correctly determine constexprness of dependent lambdas. (PR #124468)

[via cfe-commits]

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

Makes sense. After thinking about this for a bit, I don’t think there is a reason why we’d ever need to care about the parent context at all for the purpose of determining `constexpr`ness, is there?

https://github.com/llvm/llvm-project/pull/124468