Add a TODO.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130092 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/LLVMCConfigurationEmitter.cpp b/utils/TableGen/LLVMCConfigurationEmitter.cpp
index c40a39d..6572595 100644
--- a/utils/TableGen/LLVMCConfigurationEmitter.cpp
+++ b/utils/TableGen/LLVMCConfigurationEmitter.cpp
@@ -3028,6 +3028,8 @@
   FilterNotInGraph(Data.Edges, Data.ToolDescs);
 
   // Typecheck the compilation graph.
+  // TODO: use a genuine graph representation instead of a vector and check for
+  // multiple edges.
   TypecheckGraph(Data.Edges, Data.ToolDescs);
 
   // Check that there are no options without side effects (specified