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[NFC] [DAGCombine] Correct the result for sqrt even the iteration is zero

Authored by steven.zhang on Jan 24 2021, 8:00 PM.

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[NFC] [DAGCombine] Correct the result for sqrt even the iteration is zero

For now, we correct the result for sqrt if iteration > 0. This doesn't make
sense as they are not strict relative.

Reviewed By: dmgreen, spatel, RKSimon

Differential Revision: https://reviews.llvm.org/D94480

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