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/Config.h

@@ -55,6 +55,7 @@ extern char DSiNANDPath[1024];
 extern bool JIT_Enable;
 extern int JIT_MaxBlockSize;
 extern bool JIT_BrancheOptimisations;
+extern bool JIT_LiteralOptimisations;
 #endif
 
 }