live = new OPT_LiveAnalysis(false, true);
live = new OPT_LiveAnalysis(false, true,  false, ir.desiredSSAOptions.getExcludeGuards());
  private void prepare () {    if (ir.options.PRUNED_SSA) {      live = new OPT_LiveAnalysis(false,  // don't create GC maps				  true);  // skip (final) local propagation step                                          // of live analysis      live.perform(ir);    }     else if (ir.options.SEMI_PRUNED_SSA) {      computeNonLocals();    }    // minimal SSA needs no preparation  }