Move SimulatorHelper into V8 out of profiler clients.

test/cctest/libsampler/test-sampler.cc

Index: test/cctest/libsampler/test-sampler.cc
diff --git a/test/cctest/libsampler/test-sampler.cc b/test/cctest/libsampler/test-sampler.cc
index c2b11ce77c0ad72919722bc14488a8d3d9ecbbc0..b88d3479144d9e1ce5a8137b2cc1ccd4b2dd2134 100644
--- a/test/cctest/libsampler/test-sampler.cc
+++ b/test/cctest/libsampler/test-sampler.cc
@@ -41,10 +41,9 @@ class TestSampler : public Sampler {
   explicit TestSampler(Isolate* isolate) : Sampler(isolate) {}
 
   void SampleStack(const v8::RegisterState& regs) override {
-    void* frames[Sampler::kMaxFramesCount];
+    void* frames[kMaxFramesCount];
     SampleInfo sample_info;
-    isolate()->GetStackSample(regs, reinterpret_cast<void**>(frames),
-                              Sampler::kMaxFramesCount, &sample_info);
+    isolate()->GetStackSample(regs, frames, kMaxFramesCount, &sample_info);
     if (is_counting_samples_) {
       if (sample_info.vm_state == JS) ++js_sample_count_;
       if (sample_info.vm_state == EXTERNAL) ++external_sample_count_;