Don't require eliminating certain type checks in unoptimized compilation.

runtime/vm/flow_graph_builder.cc

 // Copyright (c) 2012, 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/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/class_finalizer.h"
@@ skipping 3199 matching lines @@
   StoreStaticFieldNode* node, bool result_is_needed) {
   ValueGraphVisitor for_value(owner());
   node->value()->Visit(&for_value);
   Append(for_value);
   Value* store_value = NULL;
   if (result_is_needed) {
     store_value = Bind(BuildStoreExprTemp(for_value.value()));
   } else {
     store_value = for_value.value();
   }
-  if (FLAG_enable_type_checks) {
-    const AbstractType& type = AbstractType::ZoneHandle(node->field().type());
-    const String& dst_name = String::ZoneHandle(node->field().name());
-    store_value = BuildAssignableValue(node->value()->token_pos(),
-                                       store_value,
-                                       type,
-                                       dst_name);
-  }
   StoreStaticFieldInstr* store =
       new StoreStaticFieldInstr(node->field(), store_value);
 
   if (result_is_needed) {
     Do(store);
     return BuildLoadExprTemp();
   } else {
     return store;
   }
 }
@@ skipping 738 matching lines @@
                                   LanguageError::kBailout,
                                   Heap::kNew,
                                   "FlowGraphBuilder Bailout: %s %s",
                                   String::Handle(function.name()).ToCString(),
                                   reason));
   Isolate::Current()->long_jump_base()->Jump(1, error);
   UNREACHABLE();
 }
 
 }  // namespace dart