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machineinstr whether the aliased register is dead, rather than the original register is dead. This allows it to get the correct answer when examining an instruction like this: CALLpcrel32 <ga:foo>, %AL<imp-def>, %EAX<imp-def,dead> where EAX is dead but a subregister of it is still live. This fixes PR5294. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85135 91177308-0d34-0410-b5e6-96231b3b80d8