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Commit a2136be1 authored by Jakob Stoklund Olesen's avatar Jakob Stoklund Olesen
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Use a SparseSet instead of a BitVector for UsedInInstr in RAFast. 

This is just as fast, and it makes it possible to avoid leaking the
UsedPhysRegs BitVector implementation through
MachineRegisterInfo::addPhysRegsUsed().

llvm-svn: 166083
parent 7e414261
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