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Matt Arsenault
7e7822cc8c
RegUsageInfoCollector: Don't iterate all regs for every reg class
This is extremly slow on AMDGPU, which has a lot of physical register and a lot of register classes. determineCalleeSaves, via MachineRegisterInfo::isPhysRegUsed already added all of the super registers to the saved set. llvm-svn: 365370
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