[Interpreter] Enable tracing of bytecode handler dispatches.

src/interpreter/interpreter.h

Index: src/interpreter/interpreter.h
diff --git a/src/interpreter/interpreter.h b/src/interpreter/interpreter.h
index ea50faa02d882c91bee2cdd2912a2cd6e7486db7..75a22093dfd86075d5672669d26e3986203bf0e9 100644
--- a/src/interpreter/interpreter.h
+++ b/src/interpreter/interpreter.h
@@ -53,6 +53,10 @@ class Interpreter {
     return reinterpret_cast<Address>(&dispatch_table_[0]);
   }
 
+  uintptr_t* bytecode_dispatch_count_table() {
+    return bytecode_dispatch_count_table_.get();
+  }
+
  private:
 // Bytecode handler generator functions.
 #define DECLARE_BYTECODE_HANDLER_GENERATOR(Name, ...) \
@@ -141,6 +145,7 @@ class Interpreter {
 
   Isolate* isolate_;
   Code* dispatch_table_[kDispatchTableSize];
+  v8::base::SmartArrayPointer<uintptr_t> bytecode_dispatch_count_table_;
 
   DISALLOW_COPY_AND_ASSIGN(Interpreter);
 };