[gold commit] Place copy relocations in .dynbss when target is read-only

[Cary Coutant]

Piggy-backing on PR 20995...

2016-12-27  Cary Coutant  <ccoutant@gmail.com>

gold/
        PR ld/20995
        * copy-relocs.cc (Copy_relocs::make_copy_reloc): Use .dynbss for
        read-only data when linking with -z relro.
        * copy-relocs.h (Copy_relocs::dynrelro_): New data member.
        * testsuite/Makefile.am (copy_test_relro): New test case.
        * testsuite/Makefile.in: Regenerate.
        * testsuite/copy_test_relro.cc: New source file.
        * testsuite/copy_test_relro_1.cc: New source file.
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