philnik777 4cc791bc98 [Clang] Add __datasizeof (#67805) ...

The data size is required for implementing the `memmove` optimization
for `std::copy`, `std::move` etc. correctly as well as replacing
`__compressed_pair` with `[[no_unique_address]]` in libc++. Since the
compiler already knows the data size, we can avoid some complexity by
exposing that information.

2023-11-13 11:00:07 +01:00

806 B

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