Implements features to run "Hello, world!" on simulated MIPS.

runtime/vm/class_finalizer.cc

Index: runtime/vm/class_finalizer.cc
===================================================================
--- runtime/vm/class_finalizer.cc	(revision 21753)
+++ runtime/vm/class_finalizer.cc	(working copy)
@@ -38,10 +38,6 @@
     const GrowableArray<intptr_t>& added_subclasses_to_cids) {
   ASSERT(FLAG_use_cha);
   if (added_subclasses_to_cids.is_empty()) return;
-  // TODO(regis): Reenable this code for mips when possible.
-#if defined(TARGET_ARCH_IA32) ||                                               \
-    defined(TARGET_ARCH_X64) ||                                                \
-    defined(TARGET_ARCH_ARM)
   // Deoptimize all live frames.
   DeoptimizeIfOwner(added_subclasses_to_cids);
   // Switch all functions' code to unoptimized.
@@ -63,7 +59,6 @@
       }
     }
   }
-#endif
 }