Re-establish mips basic infrastructure.

src/top.cc

 // Copyright 2006-2008 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 52 matching lines @@
 
 
 v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
   return TRY_CATCH_FROM_ADDRESS(try_catch_handler_address());
 }
 
 
 void ThreadLocalTop::Initialize() {
   c_entry_fp_ = 0;
   handler_ = 0;
-#ifdef USE_SIMULATOR
-#ifdef V8_TARGET_ARCH_ARM
+#if defined(USE_SIMULATOR) && \
+    (defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS))
   simulator_ = Simulator::current();
-#elif V8_TARGET_ARCH_MIPS
-  simulator_ = assembler::mips::Simulator::current();
-#endif
 #endif
 #ifdef ENABLE_LOGGING_AND_PROFILING
   js_entry_sp_ = NULL;
   external_callback_ = NULL;
 #endif
 #ifdef ENABLE_VMSTATE_TRACKING
   current_vm_state_ = EXTERNAL;
   runtime_profiler_state_ = Top::PROF_NOT_IN_JS;
 #endif
   try_catch_handler_address_ = NULL;
@@ skipping 1043 matching lines @@
   memcpy(to, reinterpret_cast<char*>(&thread_local_), sizeof(thread_local_));
   InitializeThreadLocal();
   return to + sizeof(thread_local_);
 }
 
 
 char* Top::RestoreThread(char* from) {
   memcpy(reinterpret_cast<char*>(&thread_local_), from, sizeof(thread_local_));
   // This might be just paranoia, but it seems to be needed in case a
   // thread_local_ is restored on a separate OS thread.
-#ifdef USE_SIMULATOR
-#ifdef V8_TARGET_ARCH_ARM
+#if defined(USE_SIMULATOR) && \
+    (defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_MIPS))
   thread_local_.simulator_ = Simulator::current();
-#elif V8_TARGET_ARCH_MIPS
-  thread_local_.simulator_ = assembler::mips::Simulator::current();
-#endif
 #endif
   return from + sizeof(thread_local_);
 }
 
 } }  // namespace v8::internal