Lang Hames 3fffe62177 Replaces uses of unsigned for indexes in LiveInterval and VNInfo with ...

a new class, MachineInstrIndex, which hides arithmetic details from
most clients. This is a step towards allowing the register allocator
to update/insert code during allocation.

llvm-svn: 81040

2009-09-04 20:41:11 +00:00

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