[IR] Revert r119493
r119493 protected against PHINode::hasConstantValue returning the PHI node itself, but a later fix in r159687 means that can never happen, so the workarounds are no longer required.
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r119493 protected against PHINode::hasConstantValue returning the PHI node itself, but a later fix in r159687 means that can never happen, so the workarounds are no longer required.