Add missing if (FLAG_verify_heap) checks around heap verification

src/execution.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/execution.h"
 
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/isolate-inl.h"
@@ skipping 91 matching lines @@
     byte* function_entry = function->code()->entry();
     JSFunction* func = *function;
     Object* recv = *receiver;
     Object*** argv = reinterpret_cast<Object***>(args);
     if (FLAG_profile_deserialization) PrintDeserializedCodeInfo(function);
     value =
         CALL_GENERATED_CODE(stub_entry, function_entry, func, recv, argc, argv);
   }
 
 #ifdef VERIFY_HEAP
-  value->ObjectVerify();
+  if (FLAG_verify_heap) {
+    value->ObjectVerify();
+  }
 #endif
 
   // Update the pending exception flag and return the value.
   bool has_exception = value->IsException();
   DCHECK(has_exception == isolate->has_pending_exception());
   if (has_exception) {
     isolate->ReportPendingMessages();
     // Reset stepping state when script exits with uncaught exception.
     if (isolate->debug()->is_active()) {
       isolate->debug()->ClearStepping();
@@ skipping 600 matching lines @@
   }
 
   isolate_->counters()->stack_interrupts()->Increment();
   isolate_->counters()->runtime_profiler_ticks()->Increment();
   isolate_->runtime_profiler()->OptimizeNow();
 
   return isolate_->heap()->undefined_value();
 }
 
 } }  // namespace v8::internal