freedreno: add debug trace for flush

Signed-off-by: Rob Clark <robdclark@gmail.com>

src/gallium/drivers/freedreno/freedreno_context.c

@@ -47,6 +47,8 @@ fd_context_flush(struct pipe_context *pctx, struct pipe_fence_handle **fencep,
 	struct fd_context *ctx = fd_context(pctx);
 	struct pipe_fence_handle *fence = NULL;
 
+	DBG("%p: flush: flags=%x\n", ctx->batch, flags);
+
 	/* Take a ref to the batch's fence (batch can be unref'd when flushed: */
 	fd_fence_ref(pctx->screen, &fence, ctx->batch->fence);