Add ASSERTs in BidiResolver and RenderBlockLineLayout

Source/platform/text/BidiRunList.h

Index: Source/platform/text/BidiRunList.h
diff --git a/Source/platform/text/BidiRunList.h b/Source/platform/text/BidiRunList.h
index 4e3cfdf090003b35d1f4942fa7c91bf7b831e915..65d480c33a3d0010e1dea12cd5beb205911802d3 100644
--- a/Source/platform/text/BidiRunList.h
+++ b/Source/platform/text/BidiRunList.h
@@ -202,9 +202,7 @@ void BidiRunList<Run>::deleteRuns()
 template <class Run>
 void BidiRunList<Run>::reverseRuns(unsigned start, unsigned end)
 {
-    if (!m_runCount)
-        return;
-
+    ASSERT(m_runCount);
     if (start >= end)
         return;