linux-user: ensure nios2 processes queued work

While async processes are rare for linux-user we do use them from time
to time. The most obvious one is tb_flush when we run out of
translation space. We will also need this when we move plugin
vcpu_init to an async task.

Fix nios2 to follow its older, wiser and more stable siblings.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240227144335.1196131-19-alex.bennee@linaro.org>
diff --git a/linux-user/nios2/cpu_loop.c b/linux-user/nios2/cpu_loop.c
index da77ede7..7fe08c8 100644
--- a/linux-user/nios2/cpu_loop.c
+++ b/linux-user/nios2/cpu_loop.c
@@ -32,6 +32,7 @@
         cpu_exec_start(cs);
         trapnr = cpu_exec(cs);
         cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
 
         switch (trapnr) {
         case EXCP_INTERRUPT: