plugins: Create TCGHelperInfo for all out-of-line callbacks

TCGHelperInfo includes the ABI for every function call.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/qemu/plugin.h

@@ -93,6 +93,7 @@ struct qemu_plugin_dyn_cb {
     union {
         struct {
             union qemu_plugin_cb_sig f;
+            TCGHelperInfo *info;
         } regular;
         struct {
             qemu_plugin_u64 entry;