[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow, copying to a smaller ar…

src/factory.h

 // Copyright 2014 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 #include "src/messages.h"
 #include "src/type-feedback-vector.h"
@@ skipping 305 matching lines @@
   Handle<JSObject> CopyJSObjectWithAllocationSite(Handle<JSObject> object,
                                                   Handle<AllocationSite> site);
 
   Handle<FixedArray> CopyFixedArrayWithMap(Handle<FixedArray> array,
                                            Handle<Map> map);
 
   Handle<FixedArray> CopyFixedArrayAndGrow(
       Handle<FixedArray> array, int grow_by,
       PretenureFlag pretenure = NOT_TENURED);
 
+  Handle<FixedArray> CopyFixedArrayUpTo(Handle<FixedArray> array, int new_len,
+                                        PretenureFlag pretenure = NOT_TENURED);
+
   Handle<FixedArray> CopyFixedArray(Handle<FixedArray> array);
 
   // This method expects a COW array in new space, and creates a copy
   // of it in old space.
   Handle<FixedArray> CopyAndTenureFixedCOWArray(Handle<FixedArray> array);
 
   Handle<FixedDoubleArray> CopyFixedDoubleArray(
       Handle<FixedDoubleArray> array);
 
   // Numbers (e.g. literals) are pretenured by the parser.
@@ skipping 362 matching lines @@
   // Create a JSArray with no elements and no length.
   Handle<JSArray> NewJSArray(ElementsKind elements_kind,
                              Strength strength = Strength::WEAK,
                              PretenureFlag pretenure = NOT_TENURED);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FACTORY_H_