Exclude StackOverflow stress-testing from PRODUCT mode

runtime/vm/runtime_entry.cc

Index: runtime/vm/runtime_entry.cc
diff --git a/runtime/vm/runtime_entry.cc b/runtime/vm/runtime_entry.cc
index 322b2bc7f4d4a60531c7080a51f28f5cebb779d5..99d4c2866ef907fbde29e1f4cadf9446910485cb 100644
--- a/runtime/vm/runtime_entry.cc
+++ b/runtime/vm/runtime_entry.cc
@@ -1621,6 +1621,7 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
     UNREACHABLE();
   }
 
+#if !defined(PRODUCT)
   // The following code is used to stress test deoptimization and
   // debugger stack tracing.
   bool do_deopt = false;
@@ -1678,7 +1679,6 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
     DeoptimizeFunctionsOnStack();
   }
   if (do_reload) {
-#ifndef PRODUCT
     JSONStream js;
     // Maybe adjust the rate of future reloads.
     isolate->MaybeIncreaseReloadEveryNStackOverflowChecks();
@@ -1687,9 +1687,7 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
     if (!success) {
       FATAL1("*** Isolate reload failed:\n%s\n", js.ToCString());
     }
-#endif
   }
-#if !defined(PRODUCT)
   if (do_stacktrace) {
     String& var_name = String::Handle();
     Instance& var_value = Instance::Handle();