[C++ Patch] PR 44908 (SFINAE vs pointer to member via virtual base)

[Paolo Carlini]

Hi again,

these further bits from my __is_convertible_to work fix the SFINAE issue
with pointers to members when virtual inheritance is involved. Even if
the patch seems large, is indeed largely mechanical and ultimately very
focused on propagating tf_none to get_delta_difference_1 in case of SFINAE.

Tested x86_64-linux. Ok for mainline?

Thanks,
Paolo.

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