Remove fields from Isolate in Product mode

runtime/vm/heap_test.cc

Index: runtime/vm/heap_test.cc
diff --git a/runtime/vm/heap_test.cc b/runtime/vm/heap_test.cc
index cc681155c4ce4bd420bc2425aa66f4a8913c07eb..c8e5352bc22753c650e65bcf8ae9c39f77dfc46e 100644
--- a/runtime/vm/heap_test.cc
+++ b/runtime/vm/heap_test.cc
@@ -18,7 +18,9 @@ TEST_CASE(OldGC) {
       "main() {\n"
       "  return [1, 2, 3];\n"
       "}\n";
+#if !defined(PRODUCT)
   FLAG_verbose_gc = true;
+#endif
   Dart_Handle lib = TestCase::LoadTestScript(kScriptChars, NULL);
   Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
 
@@ -57,7 +59,9 @@ TEST_CASE(LargeSweep) {
       "main() {\n"
       "  return new List(8 * 1024 * 1024);\n"
       "}\n";
+#if !defined(PRODUCT)
   FLAG_verbose_gc = true;
+#endif
   Dart_Handle lib = TestCase::LoadTestScript(kScriptChars, NULL);
   Dart_EnterScope();
   Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
@@ -107,6 +111,8 @@ TEST_CASE(ClassHeapStats) {
       "  var x = new A();\n"
       "  return new A();\n"
       "}\n";
+  bool saved_concurrent_sweep_mode = FLAG_concurrent_sweep;
+  FLAG_concurrent_sweep = false;
   Dart_Handle h_lib = TestCase::LoadTestScript(kScriptChars, NULL);
   Isolate* isolate = Isolate::Current();
   ClassTable* class_table = isolate->class_table();
@@ -187,6 +193,7 @@ TEST_CASE(ClassHeapStats) {
   EXPECT_EQ(0, class_stats->pre_gc.old_count);
   EXPECT_EQ(0, class_stats->post_gc.old_count);
   EXPECT_EQ(0, class_stats->recent.old_count);
+  FLAG_concurrent_sweep = saved_concurrent_sweep_mode;
 }
 
 TEST_CASE(ArrayHeapStats) {