ASan regression on Windows with MSVC 14.38.33130

[JohanEngelen]

See llvm/llvm-project#82450 and https://stackoverflow.com/a/77577172

Once fixed (upstream), apply same fix (if needed) to LDC, and re-enable CI testing (#4585)

[kinke]

Probably fixed by llvm/llvm-project#68910 landing in LLVM 18, which fixed our CI regressions (#4644).