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This sets trackLivenessAfterRegAlloc on AVRRegisterInfo.
Most existing targets set this flag. Without it, specific IR inputs
cause LLVM to fail with:
Assertion failed: (getParent()->getProperties().hasProperty( MachineFunctionProperties::Property::TracksLiveness) &&
"Liveness information is accurate"), function livein_begin
file MachineBasicBlock.cpp, line 1354.
With this commit, this no longer happens.
Patch by Peter Nimmervoll.
llvm-svn: 334409
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