[clang][Interp][NFC] Add another assertion to InterpStack::peek()

diff --git a/clang/lib/AST/Interp/InterpStack.h b/clang/lib/AST/Interp/InterpStack.h
index fd4a04a..14a9b69 100644 (file)
--- a/clang/lib/AST/Interp/InterpStack.h
+++ b/clang/lib/AST/Interp/InterpStack.h
@@ -54,6 +54,7 @@ public:
   /// Discards the top value from the stack.
   template <typename T> void discard() {
 #ifndef NDEBUG
+    assert(!ItemTypes.empty());
     assert(ItemTypes.back() == toPrimType<T>());
     ItemTypes.pop_back();
 #endif