Switch profiler from isolates to threads

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index d79c11ab17dab87a4aaf890ea1e8f64953844347..583b72dfa23ae741d7ab5e26b59f1dad1eafc082 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -550,27 +550,12 @@ class Isolate : public BaseIsolate {
     return defer_finalization_count_ == 0;
   }
 
-  Mutex* profiler_data_mutex() {
-    return &profiler_data_mutex_;
-  }
-
-  void set_profiler_data(IsolateProfilerData* profiler_data) {
-    profiler_data_ = profiler_data;
-  }
-
-  IsolateProfilerData* profiler_data() const {
-    return profiler_data_;
-  }
-
   void PrintJSON(JSONStream* stream, bool ref = true);
 
   CompilerStats* compiler_stats() {
     return compiler_stats_;
   }
 
-  // Returns the number of sampled threads.
-  intptr_t ProfileInterrupt();
-
   VMTagCounters* vm_tag_counters() {
     return &vm_tag_counters_;
   }
@@ -796,9 +781,6 @@ class Isolate : public BaseIsolate {
   // Trace buffer support.
   TraceBuffer* trace_buffer_;
 
-  IsolateProfilerData* profiler_data_;
-  Mutex profiler_data_mutex_;
-
   VMTagCounters vm_tag_counters_;
   RawGrowableObjectArray* tag_table_;