[Gold][Powerpc64] Avoid assertion in relocate

[Sterling Augustine]

Hi Cary,

Under certain conditions that have defied my best test-case reduction,
the .debug_addr section can contain references to functions that don't
have pc relative relocations in a .text section, on all architectures.
Due to the way the powerpc64 builds its address tables, these symbols
don't (and shouldn't) get added to its global_entry_table.

This patch from Alan Modra removes an assertion that the entry is
added to the table, and copes with the condition appropriately.

OK for Gold?

Sterling

ChangeLog

2015-05-04  Alan Modra  <amodra@gmail.com>

* powerpc.cc (Target_powerpc<size, big_endian>::Relocate::relocate): Handle
address not found instead of asserting.
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