Fix up this test case

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@224157 91177308-0d34-0410-b5e6-96231b3b80d8
Some more cleanup of the ValueObjectConstResultImpl code. NFC.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@224160 91177308-0d34-0410-b5e6-96231b3b80d8