[ELF] Ignore --time-trace if disableOutput

To avoid prevent generating two JSON for LLD_IN_TEST=2 ld.lld
--time-trace.

Author: MaskRay

lld/ELF/Driver.cpp

@@ -1463,7 +1463,8 @@ static void readConfigs(Ctx &ctx, opt::InputArgList &args) {
   }
   ctx.arg.thinLTOModulesToCompile =
       args::getStrings(args, OPT_thinlto_single_module_eq);
-  ctx.arg.timeTraceEnabled = args.hasArg(OPT_time_trace_eq);
+  ctx.arg.timeTraceEnabled =
+      args.hasArg(OPT_time_trace_eq) && !ctx.e.disableOutput;
   ctx.arg.timeTraceGranularity =
       args::getInteger(args, OPT_time_trace_granularity, 500);
   ctx.arg.trace = args.hasArg(OPT_trace);