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There is a known bug where the register coalescer fails to merge subranges when multiple ranges end up in the "overflow" bit 32 of the lanemasks. A proper fix for this is complicated so for now this is a workaround which lets the register coalescer drop the subregister liveness information (we just loose some precision by that) and continue. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231186 91177308-0d34-0410-b5e6-96231b3b80d8