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42e9c96392
when no virtual registers have been allocated. It was only used to resize IndexedMaps, so provide an IndexedMap::resize() method such that Map.grow(MRI.getLastVirtReg()); can be replaced with the simpler Map.resize(MRI.getNumVirtRegs()); This works correctly when no virtuals are allocated, and it bypasses the to/from index conversions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123130 91177308-0d34-0410-b5e6-96231b3b80d8
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