Change this test case so that it no longer fails in the face of Bug 21190. The failure and the bug are entirely unrelated, and it's trivial to write a repro case for that bug anyway, so no need to use this complicated test case

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@219248 91177308-0d34-0410-b5e6-96231b3b80d8