[PATCH] PR gold/21430 Fix misplacement of a relaxed section on AArch64

[Cary Coutant]

> gold/ChangeLog
>
>         PR gold/21430
>         * aarch64.cc
>         (AArch64_relobj::convert_input_section_to_relaxed_section):
>         Set the section offset to -1ULL.
>         (Target_aarch64::relocate_section): Adjust the view in case
>         of a relaxed input section.
>         * testsuite/Makefile.am (pr21430): New test.
>         * testsuite/Makefile.in: Regenerate
>         * testsuite/pr21430.s: New test source file.
>         * testsuite/pr21430.sh: New test script.

Approved and applied. Thanks!

-cary