RFR: 8355740: Update to Xcode 15.4 on macOS

Mon May 19 16:02:10 UTC 2025

On Mon, 28 Apr 2025 18:41:09 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This PR updates the compiler on macOS to Xcode 15.4 (from 14.3.1) to match JDK 25.
> 
> I ran a full headless and headful test run, including building media and WebKit. No issues were found.
> 
> NOTE: Xcode 15.4 requires macOS 14 Sonoma to build (although it is known to build on macOS 13, which might be useful for developer builds). The generated JavaFX code will run on older versions of macOS.

Reviewers: @arapte @tiainen

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PR Comment: https://git.openjdk.org/jfx/pull/1798#issuecomment-2891533230