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eliminate a use of Instruction::getPrev(), patch by Gabor Greif in 2005.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36197 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -640,7 +640,8 @@ void Verifier::visitPHINode(PHINode &PN) {
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// This can be tested by checking whether the instruction before this is
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// either nonexistent (because this is begin()) or is a PHI node. If not,
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// then there is some other instruction before a PHI.
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Assert2(&PN.getParent()->front() == &PN || isa<PHINode>(PN.getPrev()),
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Assert2(&PN == &PN.getParent()->front() ||
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isa<PHINode>(--BasicBlock::iterator(&PN)),
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"PHI nodes not grouped at top of basic block!",
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&PN, PN.getParent());
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