I wrote a nice long post but for some reason my browser decided to refresh so
it got dunked...

Anyways long story short:

RX 5700 XT, Pop OS 19.10, latest Oibaf mesa, I don't know how to check llvm
version cause search engine gave me no answer but it's probably whatever got
installed using this guide and updated: 
https://ubuntuforums.org/showthread.php?t=2425799

DDLC with Monika's After Story mod running natively
Oct 31 11:52:34 pop-os kernel: [  129.130712]
[drm:amdgpu_dm_commit_planes.constprop.0 [amdgpu]] *ERROR* Waiting for fences
timed out!
Oct 31 11:52:34 pop-os kernel: [  133.994710] [drm:amdgpu_job_timedout
[amdgpu]] *ERROR* ring sdma0 timeout, signaled seq=17012, emitted seq=17014
Oct 31 11:52:34 pop-os kernel: [  133.994747] [drm:amdgpu_job_timedout
[amdgpu]] *ERROR* Process information: process DDLC pid 3150 thread DDLC:cs0
pid 3168
Oct 31 11:52:34 pop-os kernel: [  133.994748] [drm] GPU recovery disabled.