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2adfa7e932
use virtual registers. We now allow the first instruction in a block of terminators to use virtual registers, and update phi elimination to correctly update livevar when eliminating phi's. This fixes a problem on a testcase Andrew sent me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25083 91177308-0d34-0410-b5e6-96231b3b80d8