Reapply portability fixes, this time without 64 bit system bug.

src/runtime.cc

 // Copyright 2006-2009 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 1705 matching lines @@
   int expected_parts =
       (compiled_replacement.parts() + 1) * (is_global ? 4 : 1) + 1;
   ReplacementStringBuilder builder(subject_handle, expected_parts);
 
   // Index of end of last match.
   int prev = 0;
 
   // Number of parts added by compiled replacement plus preceeding string
   // and possibly suffix after last match.
   const int parts_added_per_loop = compiled_replacement.parts() + 2;
-  bool matched;
+  bool matched = true;
   do {
     ASSERT(last_match_info_handle->HasFastElements());
     // Increase the capacity of the builder before entering local handle-scope,
     // so its internal buffer can safely allocate a new handle if it grows.
     builder.EnsureCapacity(parts_added_per_loop);
 
     HandleScope loop_scope;
     int start, end;
     {
       AssertNoAllocation match_info_array_is_not_in_a_handle;
@@ skipping 5153 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage();
   }
 }
 
 
 } }  // namespace v8::internal