[LV] Add regression test for r297610

The new test asserts that scalarized memory operations get memcheck metadata
added even if the loop is only unrolled.

Differential Revision: https://reviews.llvm.org/D30972


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@298641 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed