The patch fixes PR48633 described on 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48633.

The patch was successfully bootstrapped on x86-64.

Ok to commit?

2011-05-13  Vladimir Makarov <vmakarov@redhat.com>

         PR rtl-optimization/48633
         * ira-build.c (loop_with_eh_edge_p): New function.
         (mark_loops_for_removal): Use it.

2011-05-13  Michael Matz <matz@gcc.gnu.org>

         PR rtl-optimization/48633
         * g++.dg/pr48633.C: New test.