fix cpp11 compile errors

runtime/vm/heap_profiler.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/heap_profiler.h"
 
 #include "vm/dart_api_state.h"
 #include "vm/object.h"
 #include "vm/raw_object.h"
 #include "vm/stack_frame.h"
@@ skipping 766 matching lines @@
     if (raw_obj->IsHeapObject()) {
       // Skip visits of FreeListElements.
       if (raw_obj->GetClassId() == kFreeListElement) {
         // Only the class of the free list element should ever be visited.
         ASSERT(first == last);
         return;
       }
       uword obj_addr = RawObject::ToAddr(raw_obj);
       if (!Isolate::Current()->heap()->Contains(obj_addr) &&
           !Dart::vm_isolate()->heap()->Contains(obj_addr)) {
-        FATAL1("Invalid object pointer encountered %#"Px"\n", obj_addr);
+        FATAL1("Invalid object pointer encountered %#" Px "\n", obj_addr);
       }
     }
     profiler_->WriteRoot(raw_obj);
   }
 }
 
 
 void HeapProfilerWeakRootVisitor::VisitHandle(uword addr) {
   FinalizablePersistentHandle* handle =
       reinterpret_cast<FinalizablePersistentHandle*>(addr);
   RawObject* raw_obj = handle->raw();
   visitor_->VisitPointer(&raw_obj);
 }
 
 
 void HeapProfilerObjectVisitor::VisitObject(RawObject* raw_obj) {
   profiler_->WriteObject(raw_obj);
 }
 
 }  // namespace dart