Problem is introduced by r170053:

r170053 | bernds | 2011-02-12 05:01:19 +1300 (Sat, 12 Feb 2011) | 6
lines

        PR rtl-optimization/47166
        * reload1.c (emit_reload_insns): Disable the spill_reg_store
        mechanism for PRE_MODIFY and POST_MODIFY.
        (inc_for_reload): For PRE_MODIFY, return the insn that sets the
        reloadreg.

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Title:
  GCC 4.5 20110221 test regressions

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