Fixes a couple problems with GC of unoptimized code.

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/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
@@ skipping 2006 matching lines @@
                                      deopt_id(),
                                      dst_type(),
                                      dst_name(),
                                      locs());
   ASSERT(locs()->in(0).reg() == locs()->out().reg());
 }
 
 
 Environment* Environment::From(const GrowableArray<Definition*>& definitions,
                                intptr_t fixed_parameter_count,
-                               const Function& function) {
+                               const Code& code) {
   Environment* env =
       new Environment(definitions.length(),
                       fixed_parameter_count,
                       Isolate::kNoDeoptId,
-                      function,
+                      code,
                       NULL);
   for (intptr_t i = 0; i < definitions.length(); ++i) {
     env->values_.Add(new Value(definitions[i]));
   }
   return env;
 }
 
 
 Environment* Environment::DeepCopy(intptr_t length) const {
   ASSERT(length <= values_.length());
   Environment* copy =
       new Environment(length,
                       fixed_parameter_count_,
                       deopt_id_,
-                      function_,
+                      code_,
                       (outer_ == NULL) ? NULL : outer_->DeepCopy());
   if (locations_ != NULL) {
     Location* new_locations =
         Isolate::Current()->current_zone()->Alloc<Location>(length);
     copy->set_locations(new_locations);
   }
   for (intptr_t i = 0; i < length; ++i) {
     copy->values_.Add(values_[i]->Copy());
     if (locations_ != NULL) {
       copy->locations_[i] = locations_[i];
@@ skipping 892 matching lines @@
     ASSERT((*inputs)[i] != NULL);
     (*inputs)[i]->set_instruction(this);
     (*inputs)[i]->set_use_index(i);
   }
   deopt_id_ = original_deopt_id;
 }
 
 #undef __
 
 }  // namespace dart