[clang] [Clang] Copy initialization of an object of the same type should not consider user-defined conversions (PR #185936)

[Oliver Hunt via cfe-commits]

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

LGTM, the only question I have is whether `RequireActualConstructor` being true is common enough that it's worth short circuiting the check

https://github.com/llvm/llvm-project/pull/185936