Fix --noopt to not optimize

src/isolate.cc

 // Copyright 2012 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/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2884 matching lines @@
         context()->native_context()->get(Context::ArrayMapIndex(kind));
     if (!initial_js_array_map->IsUndefined(this)) {
       return Map::cast(initial_js_array_map);
     }
   }
   return nullptr;
 }
 
 
 bool Isolate::use_crankshaft() const {
-  return FLAG_crankshaft &&
-         !serializer_enabled_ &&
+  return FLAG_opt && FLAG_crankshaft && !serializer_enabled_ &&
          CpuFeatures::SupportsCrankshaft();
 }
 
 bool Isolate::NeedsSourcePositionsForProfiling() const {
   return FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
          FLAG_turbo_profiling || FLAG_perf_prof || is_profiling() ||
          debug_->is_active() || logger_->is_logging();
 }
 
 bool Isolate::IsArrayOrObjectPrototype(Object* object) {
@@ skipping 731 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8