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c61f7144eb
The CondOpt pass currently uses LiveIntervals to set the dead flag on a def. This patch uses MachineRegisterInfo::use_empty instead as that is equivalent to the def being dead. This removes an instance of LiveIntervals in the pass manager pipeline and saves 3.8% of compile time on llc conpiled for AArch64. Reviewed by Chad Rosier and Zhaoshi. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235532 91177308-0d34-0410-b5e6-96231b3b80d8
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