add test for this:

add test for this:

(1) Allow loop invariant expressions to come before the induction variable (instead of just
constants):

   int x;
   for (i)
    ...a[x][i]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20499 91177308-0d34-0410-b5e6-96231b3b80d8