[Bug c++/110367] [C++26] Add new built-in for std::is_within_lifetime

[hanicka at hanicka dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110367

Hana Dusíková <hanicka at hanicka dot net> changed:

           What    |Removed                     |Added
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                 CC|                            |hanicka at hanicka dot net

--- Comment #1 from Hana Dusíková <hanicka at hanicka dot net> ---
I started initial implementation of this proposal in clang. I did choose name
`bool __builtin_is_within_lifetime(const void *)`.