final void perform(OPT_IR ir) {
public final void perform(OPT_IR ir) {
  final void perform(OPT_IR ir) {    // make sure the dominator computation completed successfully    if (!ir.HIRInfo.dominatorsAreComputed)      return;    try {      OPT_DominatorTree.perform(ir, true);    } catch (OPT_OperationNotImplementedException e) {      if (ir.options.PRINT_DOMINATORS || ir.options.PRINT_SSA) {        OPT_Compiler.report(e.getMessage());      }    }  }