[gold commit] Fix --defsym to copy symbol attributes.

[Cary Coutant]

Alan Modra committed a patch to Gnu ld to fix a problem encountered on
PPC where the --defsym option wasn't copying the st_other bits to the
newly-defined symbol.

    https://sourceware.org/ml/binutils/2014-07/msg00094.html

Gold has the same problem, and additionally wasn't copying the symbol
type. This patch fixes both problems, by copying the symbol type,
visibility, and the remaining st_other bits to the new symbol for
--defsym=sym1=sym2 assignments.

-cary


2014-07-08  Cary Coutant  <ccoutant@google.com>

        * expression.cc (struct Expression::Expression_eval_info): Add
        new fields type_pointer, vis_pointer, and nonvis_pointer.
        (Expression::eval_maybe_dot): Add type_pointer, vis_pointer, and
        nonvis_pointer parameters. Adjust all calls.
        (Symbol_expression::value): Update type, visibility, and nonvis bits
        in caller.
        * script.cc (Symbol_assignment::sized_finalize): Update type,
        visibility, and remaining st_other bits for new symbol.
        * script.h: (Expression::eval_maybe_dot): Add type_pointer,
        vis_pointer, and nonvis_pointer parameters.
        * symtab.h (Symbol::set_type): New method.

        * testsuite/Makefile.am (defsym_test): New test.
        * testsuite/Makefile.in: Regenerate.
        * testsuite/defsym_test.c: New file.
        * testsuite/defsym_test.sh: New file.
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