radv: Don't free NIR shaders if tracing

Fixes a crash while generating a hang report.

Fixes: 7d45d22fdd ("radv: switch to using radv_create_shaders()")
Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_pipeline.c

@@ -1691,7 +1691,7 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
 
 	for (int i = 0; i < MESA_SHADER_STAGES; ++i) {
 		free(codes[i]);
-		if (modules[i] && !modules[i]->nir)
+		if (modules[i] && !modules[i]->nir && !pipeline->device->trace_bo)
 			ralloc_free(nir[i]);
 	}