Use C23 free_sized especially with short lived data (more so in tight loops), discussion for later

[devnexen]

Description

To see for the next major release (likely 9.0) and giving the time for the various libcs to actually implement it.
We bother giving an explicit size, the benefit doing so is performance. Indeed, the underlying memory allocator does not need to read the metadata to figure out the block size in that case.

[nielsdos]

For reference: we also already have efree_size.