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swift-mirror/validation-test/BuildSystem
Eric Miotto 8fc2598167 [build-script] Allow to tune dsymutil parallelism (#34795)
This should enable scaling when using machines with large amount of
RAM.

To better support machines with lower spec, process one binary per
dsymutil invocation (reverting #34149).

Add some (limited) facilities to gather the time taken to execute
dsymutil to better assist in tuning the parameter -- these are printed in
JSON format in the log to allow for easier scraping

```
{ "command": "dsymutil", "start": "2020-11-18T18:10:47" }
{ "command": "dsymutil", "end": "2020-11-18T18:14:45" }
```

Addresses rdar://71018443
2020-12-01 07:11:10 -08:00
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