Removes checks for stack overflow from arm and mips simulators

runtime/vm/simulator_mips.cc

Index: runtime/vm/simulator_mips.cc
===================================================================
--- runtime/vm/simulator_mips.cc	(revision 24960)
+++ runtime/vm/simulator_mips.cc	(working copy)
@@ -1007,12 +1007,8 @@
         OS::Print("Call to host function at 0x%"Pd"\n", external);
       }
 
-        if ((redirection->call_kind() == kRuntimeCall) ||
-            (redirection->call_kind() == kNativeCall)) {
-        // The top_exit_frame_info of the current isolate points to the top of
-        // the simulator stack.
-        ASSERT((StackTop() - Isolate::Current()->top_exit_frame_info()) <
-               Isolate::GetSpecifiedStackSize());
+      if ((redirection->call_kind() == kRuntimeCall) ||
+          (redirection->call_kind() == kNativeCall)) {
         // Set the top_exit_frame_info of this simulator to the native stack.
         set_top_exit_frame_info(reinterpret_cast<uword>(&buffer));
       }