For background compilation we copy ICData so that it is immutable during comnpilation. However, we …

runtime/vm/pages.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/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 343 matching lines @@
       } else {
         freelist_[type].Free(free_start, free_size);
       }
     }
   }
   return result;
 }
 
 
 uword PageSpace::TryAllocateInternal(intptr_t size,
-                            HeapPage::PageType type,
-                            GrowthPolicy growth_policy,
-                            bool is_protected,
-                            bool is_locked) {
+                                     HeapPage::PageType type,
+                                     GrowthPolicy growth_policy,
+                                     bool is_protected,
+                                     bool is_locked) {
   ASSERT(size >= kObjectAlignment);
   ASSERT(Utils::IsAligned(size, kObjectAlignment));
 #ifdef DEBUG
   SpaceUsage usage_before = GetCurrentUsage();
 #endif
   uword result = 0;
   if (size < kAllocatablePageSize) {
     if (is_locked) {
       result = freelist_[type].TryAllocateLocked(size, is_protected);
     } else {
@@ skipping 837 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>((static_cast<double>(gc_time) /
                                    static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart