RFA: small IRA fixes

[Vladimir Makarov]

This patch contains small fixes

 o in IRA_COVER_CLASSES description (it was proposed
   by Hans-Peter Nelson a few days ago.
 o a small fix in updating hard-register costs from insns
   involving hard registers.  I missed this part when I submitted
   a patch few days ago.  Non zero INSN in process_regs_for_copy
   means that the insn is a move and only move insns are currently
   taken into account in ira-costs.c.
 o some debug functions which was useful for me to solve some
   IRA performance problems.

2008-09-04  Vladimir Makarov  <vmakarov@redhat.com>

    * ira-conflicts.c (process_regs_for_copy): Check insn to check
    that the cost is already taken into account in ira-costs.c

    * ira-int.h (ira_debug_copy, ira_debug_copies): New.

    * ira-build.c (print_copy, print_copies, ira_debug_copy,
    ira_debug_copies): New.

    * doc/tm.texi (IRA_COVER_CLASSES): Fix the description.
   

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