[Interpreter] Enable tracing of bytecode handler dispatches.

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index bca3e034b3c4b4a02ca79685b0193efed054665b..1382fd1e2bffb5c314d1bfe4319804ff2f8c7b76 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -167,6 +167,9 @@ class InterpreterAssembler : public compiler::CodeStubAssembler {
   void CallPrologue() override;
   void CallEpilogue() override;
 
+  // Increment the dispatch counter for the (current, next) bytecode pair.
+  void TraceBytecodeDispatch(compiler::Node* target_index);
+
   // Traces the current bytecode by calling |function_id|.
   void TraceBytecode(Runtime::FunctionId function_id);