[clang] [Clang] [Sema] Error on reference types inside a union with msvc 1900+ (PR #102851)

[Paul Kirth via cfe-commits]

ilovepi wrote:

Hi, I think we're seeing a libc++ test fail after this patch in our Windows CI. I'm working on getting access to a windows machine to verify, but would you mind taking a look? From the blame, and because this references MSVC behavior I'm pretty sure its related, but like I said I haven't been able to confirm just yet.

Bot: https://ci.chromium.org/ui/p/fuchsia/builders/toolchain.ci/clang-windows-x64/b8739486962000738369/overview
Logs: https://logs.chromium.org/logs/fuchsia/buildbucket/cr-buildbucket/8739486962000738369/+/u/clang/test/stdout


https://github.com/llvm/llvm-project/pull/102851