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Summary: Fixed two cases of where PHI nodes need to be updated by lowerswitch. When lowerswitch find out that the switch default branch is not reachable it remove the old default and replace it with the most popular block from the cases, but it forget to update the PHI nodes in the default block. The PHI nodes also need to be updated when the switch is replaced with a single branch. Reviewers: hans, reames, arsenm Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D47203 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336659 91177308-0d34-0410-b5e6-96231b3b80d8