integrate changes from ARM64 backend and more

- better handle LDM/STM in reg alloc
- unify Halted and IRQ in anticipation for branch inlining
- literal optimisations can be disabled in gui
- jit blocks follow simple returns
- fix idle loop detection
- break jit blocks on IRQ (fixes saving in Pokemon White)

src/libui_sdl/main.cpp

@@ -2675,8 +2675,6 @@ void RecreateMainWindow(bool opengl)
 
 int main(int argc, char** argv)
 {
-    freopen("miauz.txt", "w", stdout);
-
     srand(time(NULL));
 
     printf("melonDS " MELONDS_VERSION "\n");