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IfConversion used to always add the undef flag when adding a use operand on a newly predicated instruction. This would be an operand for the register being conditionally redefined. Due to the undef flag, the liveness of this register prior to the predicated instruction would get lost. This patch changes this so that such use operands are added only when the register is live, without the undef flag. This was reverted but pushed again now, for details follow link below. Reviewed by Quentin Colombet. http://reviews.llvm.org/D209077 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277571 91177308-0d34-0410-b5e6-96231b3b80d8
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