message: Fix bad merge that dropped tool
diff: @@ -74,7 +74,7 @@ tool_names = [
  'tf_tfjs_translate', 'flatbuffer_to_string', 'flatbuffer_translate',
  'tf-mlir-translate', 'mlir-tflite-runner', 'tfcompile',
  'json_to_flatbuffer', 'xla-gpu-opt', 'xla-opt', 'hlo_to_llvm_ir',
  - 'kernel-gen-opt'
  + 'kernel-gen-opt', 'xla-thunks-opt'
  ]
  tools = [ToolSubst(s, unresolved='ignore') for s in tool_names]
  llvm_config.add_tool_substitutions(tools, tool_dirs)
  