RFC: Add SHT_GNU_PHDRS

[Florian Weimer]

* H. J. Lu:

> I am proposing
>
> #define SHT_GNU_PHDRS  0x6ffffff4  /* Dummy section for program header */
>
> This is a special read-only SHF_ALLOC zero-size data section.  It is the
> first output section, which will force a data PT_LOAD segment with program
> header before the code-only PT_LOAD segment,

Is it actually a requirement in the ELF specification that all bits
loaded via segments are covered by sections as well?

Thanks,
Florian