I'd like to add, besides the R9 270X, this also affects Vega (both traces hang
my Vega 64) and Polaris (one user reports the chapter 1, act 4 hang to be 100%
reproducible on his RX 580).

I can also confirm both traces to play fine on my card with AMD_DEBUG=mono on
mesa-git and R600_DEBUG=mono on mesa 19.0.4.

With the NIR backend (R600_DEBUG=nir) it still hangs the same way as with
default TGSI on both 19.0.4 and git.

Note: Both traces are recorded on x64 and may need to be replayed with x64
apitrace to prevent running out of memory during shader compilation.