[Bug ld/25784] [ld] Reject addresses outside [0,2**32) for ELFCLASS32

[amodra at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25784

--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
Some 32-bit targets interpret VMAs as signed.  See elf_backend_sign_extend_vma.
 For those targets the valid range of addresses is 0xffffffff80000000 to
0x7fffffff.

I don't see much benefit in diagnosing out of range addresses.  Also note that
there are practical difficulties in implementing such bounds checking given
that we'd like to have a 32-bit target linker behave the same whether it is
compiled for a 32-bit host or 64-bit host.

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