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fe42462164
instead of init'ing it maximally to zeros on entry. getFreePhysReg is pretty hot and only a few elements are typically used. This speeds up linscan by 5% on 176.gcc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47631 91177308-0d34-0410-b5e6-96231b3b80d8