[ira-improv] patch implementing proposals from a reviewer

[Vladimir Makarov]

  The following patch implements Jeff's proposals after his 1st round of 
branch changes reviews.

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

     * ira-color.c (allocnos_have_intersected_live_ranges_p): Rename to
     allocnos_conflict_by_live_ranges_p.
     (pseudos_have_intersected_live_ranges_p): Rename to
     pseudos_conflict_by_live_ranges_p.

     * ira-costs.c (record_reg_classes, scan_one_insn): Don't assign in
     if-stmts.


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