vk/device: Emit PIPE_CONTROL flushes surrounding new STATE_BASE_ADDRESS

According to the bspec, you're supposed to emit a PIPE_CONTROL with a CS
stall and a render target flush prior to chainging STATE_BASE_ADDRESS.  A
little experimentation, however, shows that this is not enough.  It also
appears as if you have to flush the texture cache after chainging base
address or things won't propagate properly.

src/vulkan/device.c

@@ -2802,8 +2802,23 @@ anv_cmd_buffer_new_surface_state_bo(struct anv_cmd_buffer *cmd_buffer)
    /* Re-emit state base addresses so we get the new surface state base
     * address before we start emitting binding tables etc.
     */
+   anv_batch_emit(&cmd_buffer->batch, GEN8_PIPE_CONTROL,
+                  .CommandStreamerStallEnable = true,
+                  .RenderTargetCacheFlushEnable = true);
    anv_cmd_buffer_emit_state_base_address(cmd_buffer);
 
+   /* It seems like just chainging the state base addresses isn't enough.
+    * If we don't do another PIPE_CONTROL afterwards to invalidate the
+    * texture cache, we still don't always get the right results.  I have
+    * no idea if this is actually what we are supposed to do, but it seems
+    * to work.
+    *
+    * FIXME: We should look into this more.  Maybe there is something more
+    * specific we're supposed to be doing.
+    */
+   anv_batch_emit(&cmd_buffer->batch, GEN8_PIPE_CONTROL,
+                  .TextureCacheInvalidationEnable = true);
+
    return VK_SUCCESS;
 }