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fa2b7e5cb4
If a dead instruction we may not only have a last-use in the main live range but also in a subregister range if subregisters are tracked. We need to partially rebuild live ranges in both cases. The testcase only broke when subregister liveness was enabled. I commited it in the current form because there is currently no flag to enable/disable subregister liveness. This fixes PR23720. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238785 91177308-0d34-0410-b5e6-96231b3b80d8
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