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This function constructs the main liverange by merging all subranges if subregister liveness tracking is available. This should be slightly faster to compute instead of performing the liveness calculation again for the main range. More importantly it avoids cases where the main liverange would cover positions where no subrange was live. These cases happened for partial definitions where the actual defined part was dead and only the undefined parts used later. The register coalescing requires that every part covered by the main live range has at least one subrange live. I also expect this function to become usefull later for places where the subranges are modified in a way that it is hard to correctly fix the main liverange in the machine scheduler, we can simply reconstruct it from subranges then. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224806 91177308-0d34-0410-b5e6-96231b3b80d8
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