RFR: 8345465: Fix performance regression on x64 after JDK-8345120

[Per Minborg]

On Wed, 4 Dec 2024 14:14:10 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> What are 'quad-string words'? FWIW, the word 'word' is somewhat ambiguous (although most people seem to interpret it as the size of an address), so you might want to specify in terms of bits/bytes instead.

Agreed. I've updated to "32-bit strings"

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PR Comment: https://git.openjdk.org/jdk/pull/22539#issuecomment-2517594200