[patch][gold] Add a tool for dumping incremental linking information

[Rafael Espindola]

The attached patch adds a simple tool that dumps the incremental
linking information. I intend to use it for testing. I should have a
patch that actually uses it tomorrow or the day after.

Once incremental linking is more mature, I will port this into
readelf. For now it is a standalone tool and I have used some gold
classes for convenience. Let me know if you would like it to be fully
independent from the start.

I have also included a small fix. The file elfcpp_file.h uses the
definition of Elf_sizes, so it should include elfcpp.h to get it.
	
elfcpp/
2009-11-23  Rafael Avila de Espindola  <espindola@google.com>

	* elfcpp_file.h: Include elfcpp.h.

gold/
2009-11-23  Rafael Avila de Espindola  <espindola@google.com>

	* Makefile.am: Build incremental-dump
	* Makefile.in: Regenerate.
	* incremental-dump.cc: New.

Cheers,
-- 
Rafael Ávila de Espíndola
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