RFR: 8360037: Refactor ImageReader in preparation for Valhalla support [v2]

[David Beaumont]

On Tue, 1 Jul 2025 18:45:49 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> test/jdk/jdk/internal/jimage/ImageReaderTest.java line 78:
>> 
>>> 76: 
>>> 77:     @Test
>>> 78:     public void testModuleDirectories() throws IOException {
>> 
>> I could make these more data driven (i.e. parametrized) if people want.
>
> yes, please, it will make failures easier to identity.

I may not get to this before taking leave, but I will do it.
It doesn't make sense to parameterise all tests, but I'll do the basic ones like this.
Not having it spin up a new jimage for each obviously helps :)

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PR Review Comment: https://git.openjdk.org/jdk/pull/26054#discussion_r2178471074