[gold][patch] Use the reader classes in incremental-dump

[Ian Lance Taylor]

Rafael Espindola <espindola@google.com> writes:

> Turns out that all that was missing was a hard coded "64, false". The
> new attached patch includes this fix and incremental-dump.cc can now
> dump information from a 32 bit binary while running in a 64bit host.

This is OK with a ChangeLog entry.  The ChangeLog entry should include
PR gold/11055.

Thanks.

Ian