Fixed issue where sometimes vm_print_registers wouldn't work for bytes

Happened because we weren't printing all relevant words due to
naturally flooring the result of division.  Here I ceil the division
to ensure we get the maximal number of words necessary.

vm/runtime.c

@@ -371,7 +371,7 @@ void vm_print_registers(vm_t *vm, FILE *fp)
       vm->registers.available / HWORD_SIZE,
       vm->registers.available / WORD_SIZE);
   fprintf(fp, "Registers.reg = [");
-  for (size_t i = 0; i < (reg.used / WORD_SIZE); ++i)
+  for (size_t i = 0; i < ceil((long double)reg.used / WORD_SIZE); ++i)
   {
     fprintf(fp, "{%lu:%lX}", i, VM_NTH_REGISTER(reg, i));
     if (i != reg.used - 1)