Enable --verify-heap in release mode

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index d6285db026bba0d530576b0216ec44f506274f7c..0d11d8a7beccae5df001bf9f0b5cc4e79ba02f87 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -1520,9 +1520,8 @@ TEST(LeakNativeContextViaMapProto) {
 
 TEST(InstanceOfStubWriteBarrier) {
   i::FLAG_allow_natives_syntax = true;
-#ifdef DEBUG
   i::FLAG_verify_heap = true;
-#endif
+
   InitializeVM();
   if (!i::V8::UseCrankshaft()) return;
   v8::HandleScope outer_scope;
@@ -1631,9 +1630,8 @@ TEST(PrototypeTransitionClearing) {
 
 TEST(ResetSharedFunctionInfoCountersDuringIncrementalMarking) {
   i::FLAG_allow_natives_syntax = true;
-#ifdef DEBUG
   i::FLAG_verify_heap = true;
-#endif
+
   InitializeVM();
   if (!i::V8::UseCrankshaft()) return;
   v8::HandleScope outer_scope;
@@ -1686,9 +1684,8 @@ TEST(ResetSharedFunctionInfoCountersDuringIncrementalMarking) {
 
 TEST(ResetSharedFunctionInfoCountersDuringMarkSweep) {
   i::FLAG_allow_natives_syntax = true;
-#ifdef DEBUG
   i::FLAG_verify_heap = true;
-#endif
+
   InitializeVM();
   if (!i::V8::UseCrankshaft()) return;
   v8::HandleScope outer_scope;