Don't always call _copyFromObjectArray.

runtime/vm/method_recognizer.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_METHOD_RECOGNIZER_H_
 #define VM_METHOD_RECOGNIZER_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
@@ skipping 286 matching lines @@
   V(ListIterator, moveNext, ListIteratorMoveNext, 210829138)                   \
   V(_FixedSizeArrayIterator, moveNext, FixedListIteratorMoveNext, 1147271335)  \
   V(_GrowableList, get:iterator, GrowableArrayIterator, 1812933946)            \
   V(_GrowableList, forEach, GrowableArrayForEach, 2085943947)                  \
   V(_List, ., ObjectArrayAllocate, 1595327584)                                 \
   V(_List, [], ObjectArrayGetIndexed, 795612476)                               \
   V(_List, []=, ObjectArraySetIndexed, 1288827575)                             \
   V(_List, get:isEmpty, ObjectArrayIsEmpty, 2130247737)                        \
   V(_List, get:iterator, ObjectArrayIterator, 458612415)                       \
   V(_List, forEach, ObjectArrayForEach, 592525445)                             \
+  V(_List, _copyFromObjectArray, ObjectArrayCopyFromObjectArray, 1985480605)   \
   V(_ImmutableList, get:iterator, ImmutableArrayIterator, 362084797)           \
   V(_ImmutableList, forEach, ImmutableArrayForEach, 63658053)                  \
   V(_ImmutableList, [], ImmutableArrayGetIndexed, 1990177341)                  \
   V(_GrowableList, [], GrowableArrayGetIndexed, 919108233)                     \
   V(_GrowableList, []=, GrowableArraySetIndexed, 1218649853)                   \
   V(_Float32Array, [], Float32ArrayGetIndexed, 856653338)                      \
   V(_Float32Array, []=, Float32ArraySetIndexed, 2086166464)                    \
   V(_Float64Array, [], Float64ArrayGetIndexed, 1779054297)                     \
   V(_Float64Array, []=, Float64ArraySetIndexed, 243929230)                     \
   V(_Int8Array, [], Int8ArrayGetIndexed, 321230586)                            \
@@ skipping 72 matching lines @@
   static Kind RecognizeKind(const Function& function);
   static bool AlwaysInline(const Function& function);
   static bool PolymorphicTarget(const Function& function);
   static const char* KindToCString(Kind kind);
   static void InitializeState();
 };
 
 }  // namespace dart
 
 #endif  // VM_METHOD_RECOGNIZER_H_