[DYNAREC] Validate alt block so it can be used

Author: ptitSeb

src/dynarec/dynablock.c

@@ -260,6 +260,7 @@ dynablock_t* CreateDBnoAlt(x64emu_t* emu, uintptr_t addr, int is32bits)
 
     dynarec_log(LOG_DEBUG, "Will call Fillblock64 for Alt %p\n", (void*)addr);
     dynablock_t* block = FillBlock64(addr, is32bits, MAX_INSTS, 0, 1);
+    if(block && block->block) block->done = 1;  // validate the alt block
 
     mutex_unlock(&my_context->mutex_dyndump);