Fix Windows 64-bit compilation error.

src/runtime.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5741 matching lines @@
   ASSERT(limit > 0);
   // Collect indices of pattern in subject using memchr.
   // Stop after finding at most limit values.
   const char* subject_start = reinterpret_cast<const char*>(subject.start());
   const char* subject_end = subject_start + subject.length();
   const char* pos = subject_start;
   while (limit > 0) {
     pos = reinterpret_cast<const char*>(
         memchr(pos, pattern, subject_end - pos));
     if (pos == NULL) return;
-    indices->Add(pos - subject_start);
+    indices->Add(static_cast<int>(pos - subject_start));
     pos++;
     limit--;
   }
 }
 
 
 template <typename SubjectChar, typename PatternChar>
 void FindStringIndices(Isolate* isolate,
                        Vector<const SubjectChar> subject,
                        Vector<const PatternChar> pattern,
@@ skipping 6827 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal