Jpeg orientation is OK now (after clearing the cache for jpeg files).
Unsharp mask fix confirmed.
Even the RL-dumpling tastes great, again.
Thanks! 
I especially like the direct integration of tcmalloc in ART, because it finally fixes all the memory issues I had with RawTherapee, plus it seems to run faster.
LD_PRELOADing libtcmalloc in RT unfortunately doesn’t fix the immense RAM usage for me 
Will play around with patching in tcmalloc in a similar way ART does…