[PATCH] Fix for PR23103. Correctly propagate the 'IsUndef' flag to the register operands of a commuted instruction.

[Andrea Di Biagio]

Thanks for the review Quentin!

I managed to further simplify the test case.
I also added check lines to verify the output assembly as you suggested.

Committed revision 236258.


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  rL LLVM

http://reviews.llvm.org/D9406

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