Does your game still work?, did you also delete the YetiShaders_PC2_DX11 files and the YetiPerforce ini file?.
LoL. It's a joke bro.
The YetiShaders_PC2_DX11.sdf or YetiShaders_PC2_DX11.sat is important files for the game.
Deleting it make your game not working.
But you can delete the *.dmp files.
No joke, my GRFS generate 800mb+ *.dmp files, damn big for an error log.
I think the *.dmp files auto-generate after the Yeti Error occured.