Reserve code range block for evacuation.

src/heap/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 4162 matching lines @@
     GCTracer::Scope sweep_scope(heap()->tracer(),
                                 GCTracer::Scope::MC_SWEEP_MAP);
     SweepSpace(heap()->map_space(), SEQUENTIAL_SWEEPING);
   }
 
   // Deallocate unmarked objects and clear marked bits for marked objects.
   heap_->lo_space()->FreeUnmarkedObjects();
 
   // Deallocate evacuated candidate pages.
   ReleaseEvacuationCandidates();
+  heap()->isolate()->code_range()->ReserveEmergencyBlock();
 
   if (FLAG_print_cumulative_gc_stat) {
     heap_->tracer()->AddSweepingTime(base::OS::TimeCurrentMillis() -
                                      start_time);
   }
 }
 
 
 void MarkCompactCollector::ParallelSweepSpaceComplete(PagedSpace* space) {
   PageIterator it(space);
@@ skipping 214 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }
 }  // namespace v8::internal