Louis Dionne 1c48c9cc43
[libc++] Implement P2985R0: std::is_virtual_base_of (#105847)
This trait is implemented in C++26 conditionally on the compiler
supporting the __builtin_is_virtual_base_of intrinsic. I believe only
tip-of-trunk Clang currently implements that builtin.

Closes #105432
2024-08-26 09:58:19 -04:00
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