Jakob Stoklund Olesen d7ea7d5cd7 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().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166083 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-17 01:37:59 +00:00
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