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
If a range has a lower bound of 0, add an AssertZext from the nearest floor power of two. This allows operations with some workitem intrinsics with known maximum ranges to use fast 24-bit multiplies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260109 91177308-0d34-0410-b5e6-96231b3b80d8