[debugger] add precise mode for code coverage.

src/objects.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 10000 matching lines @@
   array = EnsureSpace(array, length + 2);
   if (mode == kReloadLengthAfterAllocation) {
     length = array->Length();
   }
   array->Set(length, *obj1);
   array->Set(length + 1, *obj2);
   array->SetLength(length + 2);
   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();
   return kFirstIndex + Length() == capacity;
 }
 
 namespace {
 
 Handle<FixedArray> EnsureSpaceInFixedArray(Handle<FixedArray> array,
                                            int length) {
@@ skipping 10162 matching lines @@
       // depend on this.
       return DICTIONARY_ELEMENTS;
     }
     DCHECK_LE(kind, LAST_ELEMENTS_KIND);
     return kind;
   }
 }
 
 }  // namespace internal
 }  // namespace v8