winsys/amdgpu: fix infinite loop w/ RADEON_NOOP=1 caused by unsubmitted fences
winsys/amdgpu: fix infinite loop w/ RADEON_NOOP=1 caused by unsubmitted fences

Reviewed-by: Nicolai Hähnle <0d0be6cf5ad662651be2dc5dfd44aa2b09d4c1cc@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler