[lldb-instr] Add constructor and move test into lit/tools

The test had an implicit constructor for the Foo struct. Also, as the
instrumentation doesn't have to be reproducer specific, I moved the
tests into the lit/tools directory.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@354294 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed