RFR: 8376751: add preview project anchors to main-line ProblemList files

[Chen Liang]

On Fri, 30 Jan 2026 20:31:36 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> A trivial fix to add preview project anchors to main-line ProblemList files.
> 
> Also backports changes from the Valhalla repo to make/RunTests.gmk
> to support ProblemList-coh.txt files. This PR also includes the new
> ProblemList-coh.txt file, but it contains no entries (yet). Since this is
> NOT a complete backport of the changes for:
> 
> - [JDK-8375337](https://bugs.openjdk.org/browse/JDK-8375337) [lworld] ProblemList misc svc tests that fail due to JDK-8375332
> 
> I'm not handling it as a backport issue.
> 
> I've also added missing Copyright headers to some files.

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29509#pullrequestreview-3730624896