Method offToIdx

chapter20/src/test/java/com/seaofnodes/simple/Eval2.java:314–320

( long off, TypeStruct t)

        case TypeMemPtr tmp -> tmp;
        case TypeFunPtr tfp -> tfp;
        case TypeMem mem -> "MEM";
        default -> null;
        };
    }

    // Convert array size to array element count
    private static int offToIdx( long off, TypeStruct t) {
        off -= t.aryBase();
        int scale = t.aryScale();
        long mask = (1L << scale)-1;