[ARM] add loop vectorizer test based on 482.sphinx3 from SPEC2006; NFC

This is a slight reduction of one of the benchmarks
that suffered with D43079. Cost model changes should
not cause this test to remain scalarized.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326221 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed