Detect overflow of contant pool in virtual frame compiler.

src/frame-element.h

Index: src/frame-element.h
diff --git a/src/frame-element.h b/src/frame-element.h
index 3b91b9d34ac99f9056e866ebf8c014de62cb616e..ae5d6a1bf2f1859f0e8aff7d58d5dfc4937dc35b 100644
--- a/src/frame-element.h
+++ b/src/frame-element.h
@@ -113,6 +113,10 @@ class FrameElement BASE_EMBEDDED {
 
   static ZoneObjectList* ConstantList();
 
+  static bool ConstantPoolOverflowed() {
+    return !DataField::is_valid(ConstantList()->length());
+  }
+
   // Clear the constants indirection table.
   static void ClearConstantList() {
     ConstantList()->Clear();