RFR: 8345424: Move FindDebuginfoFiles out of FileUtils.gmk

[David Holmes]

On Thu, 5 Dec 2024 09:55:28 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> After [JDK-8339480](https://bugs.openjdk.org/browse/JDK-8339480), tier5 tests started failing in the `special:make:all` test. The culprit turned out to be that FindDebuginfoFiles was added to FileUtils.gmk, causing the find cache to be populated when it shouldn't be.
> 
> As a simple fix I am moving FindDebuginfoFiles into a separate file. The `DebugInfoUtils.gmk` is a bit odd since it is so specialized, and only shared among two files, but I could find no better way. The code is still a bit too complex to be duplicated, and I could not find any other place where it would belong better. The handling of debuginfo files is a bit spread out in the code base, so maybe this opens up for the chance to consolidate more debuginfo handling into this file further on.

@magicus is there a reason this was not immediately backported to jdk24 branch?

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PR Comment: https://git.openjdk.org/jdk/pull/22569#issuecomment-2526424750