VM: Remove unecessary dead code from flow-graph builder.

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/bootstrap.h"
 #include "vm/compiler.h"
 #include "vm/constant_propagator.h"
@@ skipping 2009 matching lines @@
   // For fixed length arrays if the array is the result of a known constructor
   // call we can replace the length load with the length argument passed to
   // the constructor.
   StaticCallInstr* call =
       instance()->definition()->OriginalDefinition()->AsStaticCall();
   if (call != NULL) {
     if (call->is_known_list_constructor() &&
         IsFixedLengthArrayCid(call->Type()->ToCid())) {
       return call->ArgumentAt(1);
     }
-    if (call->is_native_list_factory()) {
-      return call->ArgumentAt(0);
-    }
   }
 
   CreateArrayInstr* create_array =
       instance()->definition()->OriginalDefinition()->AsCreateArray();
   if ((create_array != NULL) &&
       (recognized_kind() == MethodRecognizer::kObjectArrayLength)) {
     return create_array->num_elements()->definition();
   }
 
   // For arrays with guarded lengths, replace the length load
@@ skipping 616 matching lines @@
   StaticCallInstr* call = value()->definition()->AsStaticCall();
   if (call == NULL) {
     return this;
   }
 
   ConstantInstr* length = NULL;
   if (call->is_known_list_constructor() &&
       LoadFieldInstr::IsFixedLengthArrayCid(call->Type()->ToCid())) {
     length = call->ArgumentAt(1)->AsConstant();
   }
-  if (call->is_native_list_factory()) {
-    length = call->ArgumentAt(0)->AsConstant();
-  }
   if ((length != NULL) &&
       length->value().IsSmi() &&
       Smi::Cast(length->value()).Value() == expected_length) {
     return NULL;  // Expected length matched.
   }
 
   return this;
 }
 
 
@@ skipping 1195 matching lines @@
   set_native_c_function(native_function);
   function().SetIsNativeAutoSetupScope(auto_setup_scope);
   Dart_NativeEntryResolver resolver = library.native_entry_resolver();
   bool is_bootstrap_native = Bootstrap::IsBootstapResolver(resolver);
   set_is_bootstrap_native(is_bootstrap_native);
 }
 
 #undef __
 
 }  // namespace dart