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c671375e8e
FoldOpIntoPhi could create an infinite loop if the PHI could potentially reach a BB it was considering inserting instructions into. The instructions it would insert would eventually lead to other combines firing which would, again, lead to FoldOpIntoPhi firing. The solution is to handicap FoldOpIntoPhi so that it doesn't attempt to insert instructions that the PHI might reach. This fixes PR21377. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221187 91177308-0d34-0410-b5e6-96231b3b80d8
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