[gn] Enable stricter build flags

src/libsampler/sampler.h

 // Copyright 2016 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.
 
 #ifndef V8_LIBSAMPLER_SAMPLER_H_
 #define V8_LIBSAMPLER_SAMPLER_H_
 
 #include "include/v8.h"
 
 #include "src/base/atomicops.h"
@@ skipping 35 matching lines @@
 
   // Whether the sampling thread should use this Sampler for CPU profiling?
   bool IsProfiling() const {
     return base::NoBarrier_Load(&profiling_) > 0 &&
         !base::NoBarrier_Load(&has_processing_thread_);
   }
   void IncreaseProfilingDepth();
   void DecreaseProfilingDepth();
 
   // Whether the sampler is running (that is, consumes resources).
-  bool IsActive() const { return base::NoBarrier_Load(&active_); }
+  bool IsActive() const { return base::NoBarrier_Load(&active_) != 0; }
 
   // CpuProfiler collects samples by calling DoSample directly
   // without calling Start. To keep it working, we register the sampler
   // with the CpuProfiler.
-  bool IsRegistered() const { return base::NoBarrier_Load(&registered_); }
+  bool IsRegistered() const { return base::NoBarrier_Load(&registered_) != 0; }
 
   void DoSample();
 
   void SetHasProcessingThread(bool value) {
     base::NoBarrier_Store(&has_processing_thread_, value);
   }
 
   // Used in tests to make sure that stack sampling is performed.
   unsigned js_sample_count() const { return js_sample_count_; }
   unsigned external_sample_count() const { return external_sample_count_; }
@@ skipping 22 matching lines @@
   base::Atomic32 active_;
   base::Atomic32 registered_;
   PlatformData* data_;  // Platform specific data.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 }  // namespace sampler
 }  // namespace v8
 
 #endif  // V8_LIBSAMPLER_SAMPLER_H_