When providing the -parseable-output flag to the swift compiler, it will provide json formatted messages about tasks that run.
I added some optional usage information in form of user time, system time and maxrss to the output. This can be used by other tools using the compiler to get some insights about time and memory usage.
Since the output does not longer match processes run (in batch mode), I also added a real_pid field so the client could reason about jobs that belong together if needed.
rdar://39798231
This patch adds additional entries to the JSON command messages output
by the Swift compiler. It's now possible to get the command executable
("command_executable") and arguments ("command_arguments") as a single
string and array, respectively, rather than having to parse the
shell-escaped command line provided in the "command" key.
<rdar://problem/35701809>
