I confirm that I have this bug or a very similar one.

It, for some reason, happens most when i'm using my IDE (Intellij based).
It will append the most when I type code and the crash occur when the IDE is
supposed to propose some code completion.

I do have one to two crash a day.

Video card is RX5700
CPU is Ryzen R7-2700X

Software tested LLVM 9 git
libdrm, mesa, ddx updated from GIT very frequently.

Bug is there since I have the card, like 3 weeks ago.