A couple minor bug-fixes for template instantiation for expressions which are sometimes potentially evaluated.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151707 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 5a2b2dc..56debcf 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -9308,6 +9308,8 @@
 }
 
 ExprResult Sema::TranformToPotentiallyEvaluated(Expr *E) {
+  assert(ExprEvalContexts.back().Context == Unevaluated &&
+         "Should only transform unevaluated expressions");
   ExprEvalContexts.back().Context =
       ExprEvalContexts[ExprEvalContexts.size()-2].Context;
   if (ExprEvalContexts.back().Context == Unevaluated)