After the hang, the following can be observed in the dmesg log:

[  123.712426] [drm:amdgpu_dm_atomic_commit_tail [amdgpu]] *ERROR* Waiting for fences timed out or interrupted!
[  128.832311] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx_0.0.0 timeout, signaled seq=33035, emitted seq=33037
[  128.832350] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* Process information: process RiseOfTheTombRa pid 4366 thread RiseOfTheT:cs0 pid 4380

I also tried attaching gdb to the game which tells me that there is indeed a thread that waits for the fence:

#0  0x00007efbf969d1fb in ioctl () from /lib64/libc.so.6
#1  0x00007efb34777170 in drmIoctl () from /lib64/libdrm.so.2
#2  0x00007efb34705d59 in amdgpu_cs_query_fence_status () from /lib64/libdrm_amdgpu.so.1
#3  0x00007efad427caa1 in radv_amdgpu_fence_wait (_ws=0x8b245c0, _fence=0x7ef940069480, absolute=true, timeout=18446744073709551615) at ../src/amd/vulkan/winsys/amdgpu/radv_amdgpu_cs.c:225
#4  0x00007efad429e336 in radv_WaitForFences (_device=0x7ef9580d7990, fenceCount=1, pFences=0x7ef94000ecb0, waitAll=0, timeout=18446744073709551615) at ../src/amd/vulkan/radv_device.c:3992
#5  0x0000000001a3d842 in ?? ()
#6  0x0000000001a08d30 in ?? ()
#7  0x0000000001a16190 in ?? ()
#8  0x0000000001522a7b in ?? ()
#9  0x00000000015dc170 in ?? ()
#10 0x00000000015e6108 in ?? ()
#11 0x000000000268580f in ?? ()
#12 0x00007efbfebae5a2 in start_thread () from /lib64/libpthread.so.0
#13 0x00007efbf96a6303 in clone () from /lib64/libc.so.6

In the meantime another thread is busy creating a pipeline:

#0  0x00007efad43ae617 in u_vector_remove (vector=0x7ef890999eb0) at ../src/util/u_vector.c:101
#1  0x00007efad4436a67 in nir_instr_worklist_pop_head (wl=0x7ef890999eb0) at ../src/compiler/nir/nir_worklist.h:149
#2  0x00007efad4436dee in nir_opt_dce_impl (impl=0x7ef89593f6b0) at ../src/compiler/nir/nir_opt_dce.c:132
#3  0x00007efad4436efc in nir_opt_dce (shader=0x7ef894905280) at ../src/compiler/nir/nir_opt_dce.c:165
#4  0x00007efad430fe7e in radv_optimize_nir (shader=0x7ef894905280, optimize_conservatively=false, allow_copies=true) at ../src/amd/vulkan/radv_shader.c:208
#5  0x00007efad4312543 in radv_shader_compile_to_nir (device=0x7ef9580d7990, module=0x7ef9245d02c0, entrypoint_name=0x2887089 "main", stage=MESA_SHADER_VERTEX, spec_info=0x0, flags=0, layout=0x7ef9486faa50) at ../src/amd/vulkan/radv_shader.c:438
#6  0x00007efad4306af9 in radv_create_shaders (pipeline=0x7ef894934d00, device=0x7ef9580d7990, cache=0x7ef95891e230, key=0x7ef951fe4fb0, pStages=0x7ef951fe5230, flags=0, pipeline_feedback=0x0, stage_feedbacks=0x7ef951fe5200) at ../src/amd/vulkan/radv_pipeline.c:2506
#7  0x00007efad430b4b4 in radv_pipeline_init (pipeline=0x7ef894934d00, device=0x7ef9580d7990, cache=0x7ef95891e230, pCreateInfo=0x7ef94b983380, extra=0x0) at ../src/amd/vulkan/radv_pipeline.c:4446
#8  0x00007efad430bb98 in radv_graphics_pipeline_create (_device=0x7ef9580d7990, _cache=0x7ef95891e230, pCreateInfo=0x7ef94b983380, extra=0x0, pAllocator=0x0, pPipeline=0x7ef949454f08) at ../src/amd/vulkan/radv_pipeline.c:4576
#9  0x00007efad430bc53 in radv_CreateGraphicsPipelines (_device=0x7ef9580d7990, pipelineCache=0x7ef95891e230, count=1, pCreateInfos=0x7ef94b983380, pAllocator=0x0, pPipelines=0x7ef949454f08) at ../src/amd/vulkan/radv_pipeline.c:4601
#10 0x00007efb0c156078 in ?? () from /home/Timur/.local/share/Steam/ubuntu12_64/libVkLayer_steam_fossilize.so
#11 0x0000000001a7f502 in ?? ()
#12 0x0000000001c26765 in ?? ()
#13 0x0000000001c26f00 in ?? ()
#14 0x000000000268580f in ?? ()
#15 0x00007efbfebae5a2 in start_thread () from /lib64/libpthread.so.0
#16 0x00007efbf96a6303 in clone () from /lib64/libc.so.6

I have the exact same problem, with self-compiled mesa-19.2.0-rc1 and llvm from git (573d81cec5c3ed27e802e4e5ceb136330386a61d) on Fedora 30 with kernel 5.3.0-0.rc5.git0.1.fc31.x86_64.

Mesa compilation flags:
cmake ../llvm -G Ninja -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D CMAKE_CXX_COPILER=/usr/bin/g++ -D PYTHON_EXECUTABLE=/usr/bin/python -D LLVM_APPEND_VC_REV=ON -D LLVM_ENABLE_RTTI=ON -D LLVM_ENABLE_FFI=ON -D FFI_INCLUDE_DIR_PATH="$(pkg-config --variable=includedir libffi)" -D LLVM_BUILD_LLVM_DYLIB=ON -D LLVM_LINK_LLVM_DYLIB=ON -D LLVM_INSTALL_UTILS=ON -D LLVM_BUILD_TESTS=OFF -D LLVM_BUILD_DOCS=ON -D LLVM_ENABLE_DOXYGEN=OFF -D LLVM_BINUTILS_INCDIR=/usr/include -D LLVM_VERSION_SUFFIX="" -DLLVM_LIBDIR_SUFFIX=64 -D POLLY_ENABLE_GPGPU_CODEGEN=ON -D LINK_POLLY_INTO_TOOLS=ON -D CMAKE_POLICY_DEFAULT_CMP0075=NEW -D LLVM_ENABLE_PROJECTS="polly;lldb;lld;compiler-rt;clang-tools-extra;clang"

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