Add some code to accurately perform odr-used marking for variables per the C++11 rules.

llvm-svn: 149641
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 6ace744..8a0e461 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -7299,6 +7299,8 @@
 
     assert(ExprCleanupObjects.empty() && "Leftover temporaries in function");
     assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
+    assert(MaybeODRUseExprs.empty() &&
+           "Leftover expressions for odr-use checking");
   }
   
   if (!IsInstantiation)