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2addf067a2
We have a detailed def/use lists for every physical register in MachineRegisterInfo anyway, so there is little use in maintaining an additional bitset of which ones are used. Removing it frees us from extra book keeping. This simplifies VirtRegMap. Differential Revision: http://reviews.llvm.org/D10911 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242173 91177308-0d34-0410-b5e6-96231b3b80d8
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