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* fold left shifts of 1, 2, 3 or 4 bits into adds This doesn't save much now, but should get a serious workout once multiplies by constants get converted to shift/add/sub sequences. Hold on! :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21282 91177308-0d34-0410-b5e6-96231b3b80d8