re PR target/49349 (gfortran.dg/char_result_3.f90 fails with -O3)
PR target/49349 * sel-sched.c (find_place_for_bookkeeping): Add new parameter (fence_to_rewind). Use it to notice when bookkeeping will be placed above a fence. Update comments. (generate_bookkeeping_insn): Rewind fence when bookkeeping code is placed just above it. Do not allow NULL place_to_insert. From-SVN: r175075
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