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    Implement PR3495: local spiller optimization. The local spiller can now keep... · a1968b0f
    Evan Cheng authored
    Implement PR3495: local spiller optimization. The local spiller can now keep availability information over BB boundaries. It visits BB's in depth first order. After visiting a BB if it find a successor which has a single predecessor it visits the successor next without clearing the availability information. This allows the successor to omit reloads or change them into copies.
    
    llvm-svn: 64298
    a1968b0f
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