Do not break in native code (including non-builtin debugger code).

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index e89efdf471a5d624595e45acf7c074a824bc66a2..0c9afd7f474ba267b6506cf9a9e683df031a2fe8 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7492,6 +7492,9 @@ class JSFunction: public JSObject {
   // Tells whether this function is builtin.
   inline bool IsBuiltin();
 
+  // Tells whether this function is defined in a native script.
+  inline bool IsNative();
+
   // Tells whether or not the function needs arguments adaption.
   inline bool NeedsArgumentsAdaption();