grab planning change

Author: David Ungar

Sources/SwiftDriver/Jobs/Planning.swift

@@ -238,7 +238,9 @@ extension Driver {
  jobGroup.append(job)
  }
  addJobGroup(jobGroup)
- } else {
+ } else if !(compilerOutputType == .swiftModule && shouldCreateEmitModuleJob) {
+ // We can skip the compile jobs if all we want is a module when it's
+ // built separately.
  let job = try compileJob(primaryInputs: primaryInputs,
  outputType: compilerOutputType,
  addJobOutputs: addJobOutputs,