Still a branch, I think. https://github.com/openjdk/valhalla

Not sure if there is any relevant reason for this to be posted at this particular point in time. The most recent early-access build is from 2022: https://jdk.java.net/valhalla/

Edit: regarding replies about the recent update date -- that update date is tied to the linked Jira issue (https://bugs.openjdk.org/browse/JDK-8251554) and the only activity four days ago was adding links to some related issues. There were some updates to the description two months ago but the History view makes it difficult to determine what those are without manually copy-and-pasting the old revisions into some sort of diff tool