Schedule merge-modules When modulewrap Job is in the Queue
Schedule merge-modules When modulewrap Job is in the Queue

In order to unblock the SwiftWASM project, which relies on an
incremental build of the Swift driver that relies on the merge-modules
job always being run. The situation appears to be something like this:

1) An incremental build is run
2) Temporary swiftmodule outputs are laid down
3) merge-modules is skipped
4) modulewrap is run anyways and reads the empty temp file

We should fix this by skipping modulewrap if we can skip merge-modules.
But for now, be conservative and fall back to the status quo behavior of
always running merge-modules whenever we encounter a modulewrap job.

roambotics/swift,JGiola/swift,jmgc/swift,parkera/swift,hooman/swift,glessard/swift,JGiola/swift,roambotics/swift,glessard/swift,xwu/swift,tkremenek/swift,rudkx/swift,rudkx/swift,hooman/swift,parkera/swift,parkera/swift,apple/swift,JGiola/swift,roambotics/swift,hooman/swift,atrick/swift,tkremenek/swift,jmgc/swift,tkremenek/swift,glessard/swift,rudkx/swift,jmgc/swift,JGiola/swift,glessard/swift,jmgc/swift,atrick/swift,gregomni/swift,apple/swift,hooman/swift,xwu/swift,tkremenek/swift,xwu/swift,hooman/swift,tkremenek/swift,parkera/swift,apple/swift,parkera/swift,jmgc/swift,tkremenek/swift,atrick/swift,glessard/swift,parkera/swift,atrick/swift,benlangmuir/swift,benlangmuir/swift,roambotics/swift,gregomni/swift,ahoppen/swift,gregomni/swift,xwu/swift,atrick/swift,xwu/swift,roambotics/swift,hooman/swift,parkera/swift,xwu/swift,JGiola/swift,ahoppen/swift,rudkx/swift,gregomni/swift,hooman/swift,benlangmuir/swift,atrick/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,gregomni/swift,JGiola/swift,rudkx/swift,jmgc/swift,ahoppen/swift,roambotics/swift,ahoppen/swift,gregomni/swift,apple/swift,benlangmuir/swift,ahoppen/swift,tkremenek/swift,rudkx/swift,apple/swift,parkera/swift,xwu/swift,apple/swift,jmgc/swift,benlangmuir/swift