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Commit 799e434e authored by Lang Hames's avatar Lang Hames
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[PBQP] Use DenseSet rather than std::set for PBQP's PoolCostAllocator 

implementation.

This is good for a ~6% reduction in total compile time on the nightly test suite
when running with -regalloc=pbqp.

llvm-svn: 220183
parent 1635f8de
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