[lworld] RFR: 8373494: [lworld] markWord preservation for ParallelGC [v4]

[Joel Sikström]

On Fri, 12 Dec 2025 19:25:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> EnableValhalla is a property that determines the answer to safe_to_read_header(), so I think it should go there.

I don't see EnableValhalla as something that determines the answer to safe_to_read_header(). Rather, we only need to check safe_to_read_header() if Valhalla is enabled. I think it's clearer to show at the call site that this is a Valhalla-specific concern, since checking if the header is safe to read or not isn't relevant otherwise.

I'll go ahead and add a comment to the current version of safe_to_read_header().

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PR Review Comment: https://git.openjdk.org/valhalla/pull/1785#discussion_r2618752202