gas: add --reloc-section-sym option

[Alan Modra]

On Mon, Jul 06, 2026 at 06:30:51PM -0700, Fangrui Song wrote:
> On Mon, Jul 6, 2026 at 6:12 PM Alan Modra <amodra@gmail.com> wrote:
> >
> >         * testsuite/gas/elf/reloc-section-sym-none.d: Accept mips64 relocs.
> 
> Thanks for fixing this, but which mips64 triple is this?
> I have tested mips64-linux-gnu among

mips64el-openbsd  +FAIL: reloc-section-sym=none
mips64-linux-gnuabi64  +FAIL: reloc-section-sym=none
mips64-openbsd  +FAIL: reloc-section-sym=none

-- 
Alan Modra