Jakob Stoklund Olesen a3cca88b41 Revert "Use MachineInstr::readsWritesVirtualRegister to determine if a register is read."
This reverts r104322. I think it was causing miscompilations.

llvm-svn: 104323
2010-05-21 17:36:32 +00:00
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2009-11-03 23:52:08 +00:00
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