message: fix typename shadowing in analyzer test
  Summary:
  GCC would reject `using A = A;`
  Fixing this from the tests.
diff: @@ -386,7 +386,7 @@ Lattice lattice({BOTTOM, PURE, IMPURE, TOP},
  using PurityDomain = sparta::
  FiniteAbstractDomain<Elements, Lattice, Lattice::Encoding, &lattice>;
  -struct Callsite {
  +struct CallsiteEdgeTarget {
  // TODO: This can be a Reduced Product with the current calling context?
  using Domain = sparta::HashedSetAbstractDomain<language::Function*>;
  @@ -396,7 +396,7 @@ struct Callsite {
  }
  };
  -using CallerContext = typename Callsite::Domain;
  +using CallerContext = typename CallsiteEdgeTarget::Domain;
  template <typename Base>
  class SimpleFunctionAnalyzer : public Base {
  @@ -591,7 +591,7 @@ struct PurityAnalysisAdaptor : public language::AnalysisAdaptorBase {
  template <typename IntraproceduralBase>
  using FunctionAnalyzer = SimpleFunctionAnalyzer<IntraproceduralBase>;
  - using Callsite = Callsite;
  + using Callsite = CallsiteEdgeTarget;
  // Optional: override call graph level fixpoint iterator type
  template <typename GraphInterface, typename Domain>
  