fix a test-only leak found by lsan, PR19521

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@207223 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Reland r206934 with a hopefully fixed test"

This reverts commit r207155.
The test was still failing.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@207225 91177308-0d34-0410-b5e6-96231b3b80d8