[Google 4.8] Fix up size of pubnames in the presence of pruned enumerators

[Sterling Augustine]

Hi Cary,

Google 4.8 calculates the size of pubnames incorrectly in the presence
of pruned enumerators. The logic in size_of_pubnames should match that
in output_pubnames.

The enclosed patch fixes that.

OK for google 4.8?

Sterling

gcc/ChangeLog

2013-07-12  Sterling Augustine  <saugust...@google.com>

        * dwarf2out.c (include_pubname_in_output): Consider die tags and
        parents.

pubnames.patch
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