Add some FIXMEs to the ASTReader code

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165138 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Serialization/ASTReaderDecl.cpp b/lib/Serialization/ASTReaderDecl.cpp
index c291b4b..5434405 100644
--- a/lib/Serialization/ASTReaderDecl.cpp
+++ b/lib/Serialization/ASTReaderDecl.cpp
@@ -322,6 +322,8 @@
     // FunctionDecl's body was written last after all other Stmts/Exprs.
     // We only read it if FD doesn't already have a body (e.g., from another
     // module).
+    // FIXME: Also consider = default and = delete.
+    // FIXME: Can we diagnose ODR violations somehow?
     if (Record[Idx++] &&
         (!Reader.getContext().getLangOpts().Modules || !FD->hasBody()))
       FD->setLazyBody(GetCurrentCursorOffset());