Backport from mainline

    Backport from mainline
        2012-03-06  Andrey Belevantsev  <abel@ispras.ru>

        PR rtl-optimization/52250
        * sel-sched-ir.c (maybe_tidy_empty_bb): Try harder to find a bb
        to put note list into.  Unconditionally call move_bb_info.
        (move_bb_info): Do not assert the blocks being in the same region,
        just drop the note list if they are not.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/branches/gcc-4_7-branch@189705 138bc75d-0d04-0410-961f-82ee72b054a4