[PATCH] libstdc++: Implement P2835R7 Expose std::atomic_ref's object address

[Yuao Ma]

Hi all,

This patch adds support for the c++26 paper "P2835R7 Expose
std::atomic_ref's object address", including test cases and feature
test macro. Please take a look when you have time, thanks!

Best regards,
Yuao
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