RFR: 8334490: Normalize string with locale invariant `toLowerCase()`

[Justin Lu]

On Tue, 18 Jun 2024 18:23:12 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> The test library `jdk.test.lib.Platform` uses no-arg `toLowerCase()` for string comparison, which should be avoided.

LGTM

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Marked as reviewed by jlu (Committer).

PR Review: https://git.openjdk.org/jdk/pull/19775#pullrequestreview-2126244306