Reduce the time spent on the bigSwiftApp performance test
Reduce the time spent on the bigSwiftApp performance test

- We do not compile Swift sources in parallel yet
- Pass the -j/-num-threads arguments to the Swift compiler to
  enable parallel compilation.
- bigSwiftApp is a single project build and no other tasks
  will be running

blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,lsmaira/gradle,gradle/gradle,lsmaira/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,lsmaira/gradle,blindpirate/gradle,gradle/gradle,robinverduijn/gradle,robinverduijn/gradle,blindpirate/gradle,gradle/gradle,lsmaira/gradle,robinverduijn/gradle,robinverduijn/gradle,lsmaira/gradle,blindpirate/gradle,robinverduijn/gradle,lsmaira/gradle,blindpirate/gradle,blindpirate/gradle,robinverduijn/gradle,lsmaira/gradle,gradle/gradle,lsmaira/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,gradle/gradle,blindpirate/gradle,gradle/gradle,lsmaira/gradle,lsmaira/gradle,robinverduijn/gradle,robinverduijn/gradle,gradle/gradle,blindpirate/gradle