[Bug rtl-optimization/22208] [4.0/4.1 Regression] flag_rename_registers is not enabled at -O3 or above

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
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   Target Milestone|---                         |4.0.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22208