Add C++ rs_std::usize and rs_std::isize wrappers in int.h#1493
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These will be used by template specializations to disambiguate between a specialization of `usize` and `u64`/`u32` (or `isize and `i64`/`i32`) when those might be the same type in C++. `rs_std::usize` and `rs_std::isize` will always be considered a new type in C++ and will never overlap with fundamental types. PiperOrigin-RevId: 952180393
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Add C++ rs_std::usize and rs_std::isize wrappers in int.h
These will be used by template specializations to disambiguate between a specialization of
usizeandu64/u32(orisize andi64/i32) when those might be the same type in C++.rs_std::usizeandrs_std::isize` will always be considered a new type in C++ and will never overlap with fundamental types.