Add unittest for LiveIntervalAnalysis::handleMove()

This re-applies r260905. It requires LiveIntervals to not require
LiveVariables which was reverted and re-applied in r267954.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268329 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed