RFR: 8373388: Reenable LTO for libsplashscreen

[Phil Race]

On Wed, 10 Dec 2025 13:27:31 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> [JDK-8372554](https://bugs.openjdk.org/browse/JDK-8372554) disabled LTO for libsplashscreen to fix an issue with the comparison build. It turns out the failure was caused by extra files that LTO produced and which were included in the image. Now that [JDK-8373255](https://bugs.openjdk.org/browse/JDK-8373255) has fixed that we should be able to reenable LTO again.

Marked as reviewed by prr (Reviewer).

> > Why was it enabled in the first place ?
> If your question is about 'why for libsplashscreen' , because we see some good lib size - benefits for this lib (there were some measurements by @mserb for this [#27976 (comment)](https://github.com/openjdk/jdk/pull/27976#issuecomment-3568427441) ) .

Yes, my question was  why splash screen out of all the libraries in the JDK.
I guess a size reduction is good, but I've no idea if it helps performance.
Note that on Linux, IIRC,  the system gif/png/jpeg libs may be used by the build, and in such a case
I doubt there's much "size" left to reduce.

I've re-tested the comparison build and it passed. So I'll approve, just for this one library.

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PR Review: https://git.openjdk.org/jdk/pull/28746#pullrequestreview-3573133409
PR Comment: https://git.openjdk.org/jdk/pull/28746#issuecomment-3647698972