Re-establish mips basic infrastructure.

src/top.cc

Index: src/top.cc
diff --git a/src/top.cc b/src/top.cc
index 78db26a50973975caeed7d114c5e48d5c5b130a6..e784b58e9002bb3a70aea172ea41e02fbe4b3ad4 100644
--- a/src/top.cc
+++ b/src/top.cc
@@ -70,12 +70,9 @@ v8::TryCatch* ThreadLocalTop::TryCatchHandler() {
 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;
@@ -1139,12 +1136,9 @@ 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_);
 }