Fix the paged space statistics report error under debug mode.

src/heap/spaces.cc

 // Copyright 2011 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/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen.h"
 #include "src/heap/mark-compact.h"
@@ skipping 2773 matching lines @@
       DCHECK(code->instruction_start() <= prev_pc &&
              prev_pc <= code->instruction_end());
       delta += static_cast<int>(code->instruction_end() - prev_pc);
       EnterComment(isolate, "NoComment", delta);
     }
   }
 }
 
 
 void PagedSpace::ReportStatistics() {
-  int pct = static_cast<int>(Available() * 100 / Capacity());
+  int pct = Capacity() > 0 ? static_cast<int>(Available() * 100 / Capacity())
+                           : 0;
   PrintF("  capacity: %" V8_PTR_PREFIX
          "d"
          ", waste: %" V8_PTR_PREFIX
          "d"
          ", available: %" V8_PTR_PREFIX "d, %%%d\n",
          Capacity(), Waste(), Available(), pct);
 
   if (heap()->mark_compact_collector()->sweeping_in_progress()) {
     heap()->mark_compact_collector()->EnsureSweepingCompleted();
   }
@@ skipping 361 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }
 }  // namespace v8::internal