Make sure that the pie charts produced by 'graph-build' and 'graph-size'
targets are sorted on the size of each piece of the pie. Otherwise, making
visual analysis is difficult, as one needs to look at the legends of each
piece and do the sorting manually in their head.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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