Delegate Load/Store/InstructionFault to S on qemu platform.

platform/qemu/src/main.rs

@@ -172,6 +172,9 @@ fn main() -> ! {
         medeleg::set_instruction_page_fault();
         medeleg::set_load_page_fault();
         medeleg::set_store_page_fault();
+        medeleg::set_instruction_fault();
+        medeleg::set_load_fault();
+        medeleg::set_store_fault();
         mie::set_mext();
         // 不打开mie::set_mtimer
         mie::set_msoft();