patch for PR42941

[Vladimir Makarov]

The patch solves PR42941.  The details can be found on

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42941

2010-02-03  Vladimir Makarov  <vmakarov@redhat.com>

    PR rtl-optimizations/42941
    * sched-deps.c (setup_insn_reg_pressure_info): Use xcalloc instead
    of xmalloc.


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