[Dwarf Patch] Use offset into debug_info for pubtype name referring to pubtype section

[Sterling Augustine]

The enclosed patch fixes a mismerge from google/gcc-4_7 to main. When
outputting a pubtype whose type has no skeleton section, it's DIE
offset should be from the comp_unit_die, instead of zero. Zero is
actually a place-holder for the end of the pubtypes.

Sterling

gcc/ChangeLog

2013-12-02 Sterling Augustine  <saugust...@google.com>

        * dwarf2out.c (output_pubnames): Use comp_unit_die ()->die_offset
when there
        isn't a skeleton die.

pubtypes-bug.tot-patch
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