Fix hot reload test mode in simdbc by supporting forced slow paths on simdbc

runtime/vm/simulator_dbc.cc

Index: runtime/vm/simulator_dbc.cc
diff --git a/runtime/vm/simulator_dbc.cc b/runtime/vm/simulator_dbc.cc
index 98049f4507a43f3ce9a4d59fbf3f414f3d6f490d..1010d1a59fa4934b1c524fe86ee3a5eafde09a84 100644
--- a/runtime/vm/simulator_dbc.cc
+++ b/runtime/vm/simulator_dbc.cc
@@ -1447,6 +1447,16 @@ RawObject* Simulator::Call(const Code& code,
   }
 
   {
+    BYTECODE(CheckStackAlwaysExit, A);
+    {
+      Exit(thread, FP, SP + 1, pc);
+      NativeArguments args(thread, 0, NULL, NULL);
+      INVOKE_RUNTIME(DRT_StackOverflow, args);
+    }
+    DISPATCH();
+  }
+
+  {
     BYTECODE(DebugStep, A);
     if (thread->isolate()->single_step()) {
       Exit(thread, FP, SP + 1, pc);