I've resolved the conflicts on the ira-improv with latest big changes in 
IRA (Bernd's and Richard Sandiford patches).  I also take all proposals 
I got into account.  Here is the first patch which removes explicit 
coalescing.  It was a part of patch removing cover classes.

Ok to commit into the trunk.

2010-08-11  Vladimir Makarov <vmakarov@redhat.com>

     * common.opt (fira-coalesce): Remove.

     * doc/invoke.texi (flag_ira_coalesce): Remove.

     * ira-color.c (allocno_coalesced_p): Move before
     copy_freq_compare_func.
     processed_coalesced_allocno_bitmap): Ditto.
     (update_conflict_hard_regno_costs): Don't use
     ALLOCNO_FIRST_COALESCED_ALLOCNO.
     (allocno_cost_compare_func, print_coalesced_allocno): Remove.
     (assign_hard_reg): Assume no coalesced allocnos.
     (get_coalesced_allocnos_attributes): Remove.
     (bucket_allocno_compare_func): Assume no coalesced allocnos.
     (push_allocno_to_stack): Ditto.
     (remove_allocno_from_bucket_and_push): Use
     ira_print_expanded_allocno instead of print_coalesced_allocno.
     (push_allocnos_to_stack): Assume uncoalesced allocnos.
     (all_conflicting_hard_regs_coalesced): Ditto.  Rename to
     all_conflicting_hard_regs.
     (setup_allocno_available_regs_num): Assume uncoalesced allocnos.
     (setup_allocno_left_conflicts_size): Ditto.
     (put_allocno_into_bucket): Ditto.
     (copy_freq_compare_func): Remove.
     (copy_freq_compare_func, merge_allocnos): Move before
     coalesced_pseudo_reg_freq_compare.
     coalesced_allocno_conflict_p): Ditto.
     (coalesced_allocno_conflict_p, coalesce_allocnos): Ditto.  Remove
     parameter.  Assume it true.
     (color_allocnos): Assume uncoalesced allocnos.  Use
     ira_print_expanded_allocno instead of print_coalesced_allocno.
     (ira_sort_regnos_for_alter_reg): Call coalesce_allocnos without
     parameter.

     * ira.c: Remove comment about coalescing.