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Heavily refactor handleVirtualRegisterDef, adding comments and making it more efficient. It is also much easier to follow and convince ones self that it is correct :) Add -debug output to the joine, showing the result of joining the intervals. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14989 91177308-0d34-0410-b5e6-96231b3b80d8