[QBS] Performance regression with latest QtCreator (3.2 branch)

[Thomas Epting]

Hi everyone,

It seems there is a notable performance regression when using the latest
QtCreator / Qbs from the 3.2 branch.

I'm doing these actions for the same (non-trivial) project in 3.1.2 and 3.2
Creator:
 1. Do a „null“ build (nothing to do) several times, use “Elapsed time”
from last try.
 2. Select Build | Reparse Qbs several times, clock each time and use
average.
 3. Add a newline in any .qbs file and press save. Retry several times,
clock until “Evaluating” becomes green and use average.

Timings for QtCreator 3.2:
 1. Null Build: 0:27
 2. Reparse Qbs: 0:01
 3. Evaluation after null-change + Save: 0:36

Timings for QtCreator 3.1.2:
 1. Null Build: 0:03
 2. Reparse Qbs: 0:01
 3. Evaluation after null-change + Save: 0:09

Any ideas why everything takes so much longer now?

Regards,
Thomas
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