Fix the last USE_SIMULATOR mips issue introduced with my last arm

simulator change.

Review URL: http://codereview.chromium.org/4151005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5722 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/top.h

@@ -105,7 +105,11 @@ class ThreadLocalTop BASE_EMBEDDED {
   Address handler_;   // try-blocks are chained through the stack
 
 #ifdef USE_SIMULATOR
+#ifdef V8_TARGET_ARCH_ARM
   assembler::arm::Simulator* simulator_;
+#elif V8_TARGET_ARCH_MIPS
+  assembler::mips::Simulator* simulator_;
+#endif
 #endif  // USE_SIMULATOR
 
 #ifdef ENABLE_LOGGING_AND_PROFILING