Disable write protect mode temporarily until we have a fix for the random crashes

runtime/vm/code_patcher.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/code_patcher.h"
 #include "vm/cpu.h"
 #include "vm/instructions.h"
 #include "vm/object.h"
 #include "vm/virtual_memory.h"
 
 namespace dart {
 
-DEFINE_FLAG(bool, write_protect_code, true, "Write protect jitted code");
+DEFINE_FLAG(bool, write_protect_code, false, "Write protect jitted code");
 
 
 WritableInstructionsScope::WritableInstructionsScope(uword address,
                                                      intptr_t size)
     : address_(address), size_(size) {
   if (FLAG_write_protect_code) {
     bool status =
         VirtualMemory::Protect(reinterpret_cast<void*>(address),
                                size,
                                VirtualMemory::kReadWrite);
@@ skipping 107 matching lines @@
     const uword obj_start = code.GetPointerOffsetAt(i) + code.EntryPoint();
     const uword obj_end  = obj_start + kWordSize;
     if ((obj_start < limit) && (obj_end > patch_addr)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart