radv: Disallow indirect outputs for GS on GFX9 as well.

Since it also uses the output vector before writing to memory.

Fixes: e38685cc 'Revert "radv: disable support for VEGA for now."'
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/amd/vulkan/radv_shader.c

@@ -265,9 +265,7 @@ radv_shader_compile_to_nir(struct radv_device *device,
 		indirect_mask |= nir_var_shader_in;
 	}
 	if (!llvm_has_working_vgpr_indexing &&
-	    (nir->info.stage == MESA_SHADER_VERTEX ||
-	     nir->info.stage == MESA_SHADER_TESS_EVAL ||
-	     nir->info.stage == MESA_SHADER_FRAGMENT))
+	    nir->info.stage != MESA_SHADER_TESS_CTRL)
 		indirect_mask |= nir_var_shader_out;
 
 	/* TODO: We shouldn't need to do this, however LLVM isn't currently