Add workaround to turn precompilation-release builders green.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 7250 matching lines @@
 }
 
 
 void SignatureData::set_signature_type(const Type& value) const {
   StorePointer(&raw_ptr()->signature_type_, value.raw());
   // If the signature type is resolved, the parent function is not needed
   // anymore (type parameters may be declared by generic parent functions).
   // Keeping the parent function can unnecessarily pull more objects into a
   // snapshot. Also, the parent function is meaningless once the signature type
   // is canonicalized.
+
+// TODO(rmacnak): Keeping the parent function for unresolved signature types
+// is causing a tree shaking issue in AOT. Please, investigate.
+#if 0
   if (value.IsResolved()) {
-    set_parent_function(Function::Handle());  // TODO(rmacnak): Removing this
-    // line causes a tree shaking issue in AOT. Please, investigate.
+    set_parent_function(Function::Handle());
   }
+#else
+  set_parent_function(Function::Handle());
+#endif
 }
 
 
 RawSignatureData* SignatureData::New() {
   ASSERT(Object::signature_data_class() != Class::null());
   RawObject* raw = Object::Allocate(SignatureData::kClassId,
                                     SignatureData::InstanceSize(), Heap::kOld);
   return reinterpret_cast<RawSignatureData*>(raw);
 }
 
@@ skipping 15587 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart