Use unified YAML schemas in the build process

In this commit we instruct the build system to use the unified schema
files  instead of collecting the `TUPLE-TREE-YAML` comments.

The fixes to C++ files are necessary because they depend on the order
of the fields in the schema, which was changed.

lib/EarlyFunctionAnalysis/ControlFlowGraph.cpp

@@ -298,6 +298,10 @@ void ControlFlowGraph::dumpCFG(const model::Binary &Binary) const {
   WriteGraph(&G, "function-metadata");
 }
 
+const CallEdge *FunctionEdgeBase::getCallEdge() const {
+  return llvm::dyn_cast<CallEdge>(this);
+}
+
 bool FunctionEdgeBase::verify() const {
   return verify(false);
 }