Hopefully fix flaky mullapudi reorder test #8542
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This tested vectorized code against scalar code, but the scalar code was something that could be potentially be optimized by llvm quite cleverly - it was just a linear combination of the loop variables. This changes the test to be less of a weird corner case, while still preserving the important property - the evaluation of f is fine under any storage ordering. Hopefully this will make it flake less often.