Mark de Wever 606e280811 [libc++][format] Use forwarding references.
This implements a not accepted LWG issue. Not doing so would require
integral types to use the handle class instead of being directly stored
in the basic_format_arg.

The previous code used `std::forward` in places where it wasn't required
by the Standard. These are now removed.

Implements:
- P2418R2 Add support for std::generator-like types to std::format
- LWG 3631 basic_format_arg(T&&) should use remove_cvref_t<T> throughout

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D127570
2022-07-10 17:19:28 +02:00
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