`c < 32 || c == 34` is equivalent to `c ^ 2 < 33`.

Found in: https://lemire.me/blog/2025/04/13/detect-control-characters-quotes-and-backslashes-efficiently-using-swar/

The gain seem mostly present on micro-benchmark, and even there aren't
very consistent, but it's never slower.

```
== Encoding long string (124001 bytes)
ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +YJIT +PRISM [arm64-darwin24]
Warming up --------------------------------------
               after     5.295k i/100ms
Calculating -------------------------------------
               after     55.796k (± 3.4%) i/s   (17.92 μs/i) -    280.635k in   5.035690s

Comparison:
              before:    49840.7 i/s
               after:    55795.8 i/s - 1.12x  faster
```