Fix test change in r290736: restore index generation

I remove one extra line, but because annoyingly llvm-lit does not
clean the output directory before running the test, it didn't fail
locally (the file was present from a previous run).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290740 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed