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Add FLAGS_REG clobber to kxnor<mode>


Hello!

We are splitting it to normal XOR that includes clobber, so better
start with the clobber from the beginning.

2013-10-20  Uros Bizjak  <ubizjak@gmail.com>

    * config/i386/i386.md (kxnor<mode>): Add FLAGS_REG clobber.

Tested on x86_64-pc-linux-gnu and committed to mainline SVN.

Uros.

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