[debugger] add precise mode for code coverage.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 243b10b222a0a662165d57a82a46b852d1ddf7f4..f311b523ffcf6f86c27d5f889a7399f7a565e535 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10018,6 +10018,12 @@ Handle<ArrayList> ArrayList::Add(Handle<ArrayList> array, Handle<Object> obj1,
   return array;
 }
 
+Handle<ArrayList> ArrayList::New(Isolate* isolate, int size) {
+  Handle<ArrayList> result = Handle<ArrayList>::cast(
+      isolate->factory()->NewFixedArray(size + kFirstIndex));
+  result->SetLength(0);
+  return result;
+}
 
 bool ArrayList::IsFull() {
   int capacity = length();