Disable --deoptimize-every/--stacktrace-every in kernel isolate

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 6a74969c65c8c5a2f77d613d95db1a0fdd9f2632..a13eb71ee4e68810e7d666ed19153d6ef7c58da1 100644
--- a/runtime/vm/runtime_entry.cc
+++ b/runtime/vm/runtime_entry.cc
@@ -14,6 +14,7 @@
 #include "vm/deopt_instructions.h"
 #include "vm/exceptions.h"
 #include "vm/flags.h"
+#include "vm/kernel_isolate.h"
 #include "vm/message.h"
 #include "vm/message_handler.h"
 #include "vm/object_store.h"
@@ -1629,18 +1630,28 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
       isolate->reload_every_n_stack_overflow_checks();
   if ((FLAG_deoptimize_every > 0) || (FLAG_stacktrace_every > 0) ||
       (isolate_reload_every > 0)) {
-    // TODO(turnidge): To make --deoptimize_every and
-    // --stacktrace-every faster we could move this increment/test to
-    // the generated code.
-    int32_t count = thread->IncrementAndGetStackOverflowCount();
-    if (FLAG_deoptimize_every > 0 && (count % FLAG_deoptimize_every) == 0) {
-      do_deopt = true;
-    }
-    if (FLAG_stacktrace_every > 0 && (count % FLAG_stacktrace_every) == 0) {
-      do_stacktrace = true;
-    }
-    if ((isolate_reload_every > 0) && (count % isolate_reload_every) == 0) {
-      do_reload = isolate->CanReload();
+#if defined(DART_PRECOMPILED_RUNTIME)
+    const bool is_kernel_isolate = false;
+#else
+    // Certain flags should not effect the kernel isolate itself.  They might be
+    // used by tests via the "VMOptions=--..." annotation to test VM
+    // functionality in the main isolate.
+    const bool is_kernel_isolate = KernelIsolate::IsKernelIsolate(isolate);
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)
+    if (!is_kernel_isolate) {
+      // TODO(turnidge): To make --deoptimize_every and
+      // --stacktrace-every faster we could move this increment/test to
+      // the generated code.
+      int32_t count = thread->IncrementAndGetStackOverflowCount();
+      if (FLAG_deoptimize_every > 0 && (count % FLAG_deoptimize_every) == 0) {
+        do_deopt = true;
+      }
+      if (FLAG_stacktrace_every > 0 && (count % FLAG_stacktrace_every) == 0) {
+        do_stacktrace = true;
+      }
+      if ((isolate_reload_every > 0) && (count % isolate_reload_every) == 0) {
+        do_reload = isolate->CanReload();
+      }
     }
   }
   if ((FLAG_deoptimize_filter != NULL) || (FLAG_stacktrace_filter != NULL) ||