Pete Cooper 037b700b7f [AArch64] Use MachineRegisterInfo instead of LiveIntervals to calculate liveness. NFC. ...

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.

llvm-svn: 235532

2015-04-22 18:05:13 +00:00

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